内容正文:
小数混合运算专项练习二(含答案)
1. 6.3+3.7×2.8.
1. 2.15+8.73+1.27+7.85
1. 11.87﹣(8.2+1.87)
1. 5.42﹣3.87﹣1.13
1. 4.38﹣1.56+0.62﹣0.44
1. 0.4×270×2.
1. (40+1.25)×8
1. (12.5﹣0.05)×8
1. 2.6×8.5+8.5×7.4
1. 9.9×6.9﹣6.9×3.9
1. 5.6×99+5.6
1. 2.5×(1.9+1.9+1.9+1.9)
1. 7.2÷1.25÷8.
1. 52.4﹣(15+0.6)÷1.6
1. 9.87×99+9.87
1. 46.8÷0.9÷0.4
1. 5.5×17.3+6.7×5.5.
1. 99×4.2+4.2
1. 0.25×1.25×3.2
1. 6.4×14+15×6.4+6.4
1. (1.3+1.3×0.125×8)÷(80﹣77.4)
1. 4×(25+2.5+0.25)÷111
1. 6.25÷〔(17.2﹣3.6×4.5)÷0.32〕
1. 28.4×99+28.4
1. 0.94×2.5﹣0.45
1. 4×0.8×12.5×2.5
1. 17.5÷0.25×17+13.
1. 10.1×87
1. 2.3+3.19÷(22﹣19.8)
1. 1.25×7.2.
1. 9.1﹣1.2÷6﹣6.24
1. 7.3+12.8﹣3.8×2.3
1. (5.36+7.64)÷13×100
1. 7.575÷[(5.63﹣1.88)×0.2].
1. 7.5﹣(5.5+1.24)
1. 0.26+15.68+9.74+2.32
1. 13.26+9.55﹣3.26
1. 6.1+3.9﹣6.1+3.9.
1. 31.7÷0.63(保留2位小数)
1. 2.4×1.5+3.6÷1.5
1. 0.32×0.25+0.08÷4
1. (9.6+1.48÷3.7)÷8
1. 5.8÷[4×(1.34﹣0.14)]
1. 5.4÷[0.51÷(1.2﹣1.03)].
(45)21.35﹣3.25﹣16.75
(46)33.02﹣(148.4﹣90.85)÷2.5
(47)32×2.5×0.125
(48)18.1+(3﹣0.299÷0.23)×1.
(49)67﹣(2.98+0.67)
(50)8×16﹣73.8×6
(51)(45+14)÷73+710.
(52)13.7×0.125×8
(53)0.8×[13﹣(3.12+5.28)]
(54)102×0.56
(55)1.53×1.7+0.47×1.7.
(56)5.18+0.73+0.82
(57) 0.75×1.8÷1.5
(58) 12.5×7.1×0.8
(59) 6.12×99+6.12
(60) 8.6÷0.86+8×0.35
(61) 5.6×(18.5﹣8.5÷0.5)
(62) 0.125×4.78×80
(63) 2.8×3.6+1.4×2.8
(64) (0.4+40)×2.5
(65) 78.7﹣17.7×3.6
(66) 18÷[0.3×(8﹣6.5)]
(67) 12.7+12.5+0.5.
(68) 91÷2.6÷0.05=
(69) 6.3×3.7+6.3×6.3=
(70) (3.7+1.7×0.4)÷2.5=
(71) 7.28+3.2÷2.5=
(72) 0.74+0.9×7.4=
(73) 7.8÷0.125÷0.8=
(74) 37.5÷[0.3×(1.34﹣0.84)]
(75) (2.5+27.75÷1.5)×1.6.
(76) 6.21﹣3.8+2.2
(77) 6.03+3.7+2.97
(78) 17.43﹣6.57﹣2.43
(79) 20.47﹣(1.47+6.8)
(80) 13.26+4.71+3.47+5.29
参考答案:
(1)6.3+3.7×2.8,
=6.3+10.36,
=16.66.
(2)2.15+8.73+1.27+7.85
=(2.15+7.85)+(8.73+1.27),
=10+10,
=20;
(3)11.87﹣(8.2+1.87),
=11.87﹣1.87﹣8.2,
=10﹣8.2,
=1.8;
(4)5.42﹣3.87﹣1.13,
=5.42﹣5,
=0.42;
(5)4.38﹣1.56+0.62﹣0.44,
=(4.38+0.62)﹣(1.56+0.44),
=5﹣2,
=3;
(6)0.4×270×2.5,
=(0.4×2.5)×270,
=270;
(7)(40+1.25)×8,
=40×8+1.25×8,
=320+10,
=330;
(8)(12.5﹣0.05)×8,
=12.5×8﹣0.05×8,
=100﹣0.4,
=99.6;
(9)2.6×8.5+8.5×7.4,
=(2.6+7.4)×8.5,
=85;
(10)9.9×6.9﹣6.9×3.9,
=(9.9﹣3.9)×6.9,
=6×6.9,
=41.4;
(11)5.6×99+5.6,
=5.6×(99+1),
=560;
(12)2.5×(1.9+1.9+1.9+1.9),
=2.5×4×1.9,
=10×1.9,
=19;
(13)7.2÷1.25÷8,
=7.2÷8÷1.25,
=0.9÷1.25,
=0.72.
(14)52.4﹣(15+0.6)÷1.6,
=52.4﹣15.6÷1.6,
=52.4﹣9.75,
=42.65;
(15)9.87×99+9.87,
=9.87×(99+1),
=987;
(16)46.8÷0.9÷0.4,
=46.8÷(0.9×0.4),
=46.8÷0.36,
=130;
(17)5.5×17.3+6.7×5.5,
=5.5×(17.3+6.7),
=5.5×24,
=132
(18)99×4.2+4.2
=4.2×(99+1),
=4.2×100,
=420;
(19)0.25×1.25×3.2
=0.25×1.25×(4×0.8),
=0.25×4×(1.25×0.8),
=1×1,
=1;
(20)6.4×14+15×6.4+6.4
=6.4×(14+15+1),
=6.4×30,
=192;
(21)(1.3+1.3×0.125×8)÷(80﹣77.4)
=(1.3+1.3×1)÷2.6,
=2.6÷2.6,
=1;
(22)4×(25+2.5+0.25)÷111
=(4×25+4×2.5+4×0.25)÷111,
=(100+10+1)÷111,
=111÷111,
=1;
(23)6.25÷[(17.2﹣3.6×4.5)÷0.32]
=6.25÷[(17.2﹣16.2)÷0.32],
=6.25÷(1÷0.32),
=6.25÷3.125,
=2
(24)28.4×99+28.4,
=28.4×(99+1),
=28.4×100,
=2840.
(25)0.94×2.5﹣0.45,
=2.35﹣0.45,
=1.9.
(26)4×0.8×12.5×2.5,
=(4×2.5)×(0.8×12.5),
=10×10,
=100.
(27)17.5÷0.25×17+13,
=70×17+13,
=1190+13,
=1203
(28)10.1×87,
=(10+0.1)×87,
=87+8.7,
=95.7;
(29)2.3+3.19÷(22﹣19.8),
=2.3+3.19÷2.2,
=2.3+1.45,
=3.75;
(30)1.25×7.2,
=1.25×8×0.9,
=10×0.9,
=9
(31)9.1﹣1.2÷6﹣6.24
=9.1﹣0.2﹣6.24,
=8.9﹣6.24,
=2.66;
(32)7.3+12.8﹣3.8×2.3
=20.1﹣8.74,
=11.36;
(33)(5.36+7.64)÷13×100
=13÷13×100,
=100;
(34)7.575÷[(5.63﹣1.88)×0.2]
=7.575÷[3.75×0.2],
=7.575÷0.75,
=10.1
(35)7.5﹣(5.5+1.24),
=7.5﹣5.5﹣1.24,
=2﹣1.24,
=0.76;
(36)0.26+15.68+9.74+2.32,
=(0.26+9.74)+(15.68+2.32),
=10+18,
=28;
(37)13.26+9.55﹣3.26,
=13.26﹣3.26+9.55,
=10+9.55,
=19.55;
(38)6.1+3.9﹣6.1+3.9,
=6.1﹣6.1+(3.9+3.9),
=0+7.8,
=7.8
(39)31.7÷0.63≈50.32;
(40)2.4×1.5+3.6÷1.5
=3.6+2.4,
=6;
(41)0.32×0.25+0.08÷4
=0.08+0.08÷4,
=0.08+0.02,
=0.08+0.02,
=0.1;
(42)(9.6+1.48÷3.7)÷8
=(9.6+0.4)÷8,
=10÷8,
=1.25;
(43)5.8÷[4×(1.34﹣0.14)]
=5.8÷[4×1.2],
=5.8÷4.8,
≈1.21;
(44)5.4÷[0.51÷(1.2﹣1.03)]
=5.4÷[0.51÷0.17],
=5.4÷3,
=1.8
(45)21.35﹣3.25﹣16.75,
=21.35﹣(3.25+16.75),
=21.35﹣20,
=1.35;
(46)33.02﹣(148.4﹣90.85)÷2.5,
=33.02﹣57.55÷2.5,
=33.02﹣23.02,
=10;
(47)32×2.5×0.125,
=4×8×2.5×0.125,
=(4×2.5)×(8×0.125),
=10×1,
=10;
(48)18.1+(3﹣0.299÷0.23)×1,
=18.1+(3﹣1.3)×1,
=18.1+1.7×1,
=18.1+1.7,
=19.8
(49)67﹣(2.98+0.67),
=67﹣3.65,
=63.35;
(50)8×16﹣73.8×6,
=128+442.8,
=570.8;
(51)(45+14)÷73+710,
=59÷73+710,
=+710,
=710
(52)13.7×0.125×8,
=13.7×(0.125×8),
=13.7×1,
=13.7;
(53)0.8×[13﹣(3.12+5.28)],
=0.8×[13﹣8.4],
=0.8×4.6,
=3.68;
(54)102×0.56,
=(100+2)×0.56,
=100×0.56+2×0.56,
=56+1.12,
=57.12;
(55)1.53×1.7+0.47×1.7,
=(1.53+0.47)×1.7,
=2×1.7,
=3.4
(56)5.18+0.73+0.82,.
=(5.18+0.82)+0.73,
=6+0.73,
=6.73;
(57)0.75×1.8÷1.5,
=1.35÷1.5,
=0.9;
(58)12.5×7.1×0.8,
=(12.5×0.8)×7.1,
=10×7.1,
=71;
(59)6.12×99+6.12,
=6.12×(99+1),
=6.12×100,
=612;
(60)8.6÷0.86+8×0.35,
=10+2.8,
=12.8;
(61)5.6×(18.5﹣8.5÷0.5),
=5.6×(18.5﹣17),
=5.6×1.5,
=8.4
(62)0.125×4.78×80,
=0.125×4.78×8×10,
=(0.125×8)×(4.78×10),
=1×47.8,
=47.8;
(63)2.8×3.6+1.4×2.8,
=2.8×(3.6+1.4),
=2.8×5,
=14;
(64)(0.4+40)×2.5,
=0.4×2.5+40×2.5,
=1+100,
=101;
(65)78.7﹣17.7×3.6,
=78.7﹣63.72,
=14.98;
(66)18÷[0.3×(8﹣6.5)],
=18÷[0.3×1.5],
=18÷0.45,
=40;
(67)12.7+12.5+0.5,
=12.7+(12.5+0.5),
=12.7+13,
=25.7
(68)91÷2.6÷0.05,
=35÷0.05,
=700;
(69)6.3×3.7+6.3×6.3,
=6.3×(3.7+6.3),
=6.3×10,
=63;
(70)(3.7+1.7×0.4)÷2.5,
=(3.7+0.68)÷2.5,
=4.38÷2.5,
=1.752;
(71)7.28+3.2÷2.5,
=7.28+1.28,
=8.56;
(72)0.74+0.9×7.4,
=(1+9)×0.74,
=10×0.74,
=7.4;
(73)7.8÷0.125÷0.8,
=7.8÷(0.125×0.8),
=7.8÷0.1,
=78
(74)37.5÷[0.3×(1.34﹣0.84)],
=37.5÷[0.3×0.5],
=37.5÷0.15,
=250;
(75)(2.5+27.75÷1.5)×1.6,
=(2.5+18.5)×1.6,
=21×1.6,
=33.6
(76)6.21﹣3.8+2.2,
=2.41+2.2,
=4.61;
(77)6.03+3.7+2.97,
=(6.03+2.97)+3.7,
=9+3.7,
=12.7;
(78)17.43﹣6.57﹣2.43,
=17.43﹣(6.57+2.43),
=17.43﹣9,
=8.43;
(79)20.47﹣(1.47+6.8),
=20.47﹣1.47﹣6.8,
=19﹣6.8,
=12.2;
(80)13.26+4.71+3.47+5.29,
=(13.26+3.47)+(4.71+5.29),
=16.73+10,
=26.73;
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