内容正文:
简便运算
1.
2.
120-180÷15+48 (18) 0.8×2.7+7.3
3780÷35+19×105 ()×18 [(]
3.
7.46-5.75+3.54-2.25
4.
4.8×[1÷(3.1-3.08)]
5.
2.5×3.2×12.5
6.
① ② ③
④ ⑤ ⑥
7.
8.
) 0.79×99+0.79
3.8×97+0.38×30 1 ()×9×12
9.
+ (11-4.6)÷0.8×7.5
6.4-+3.6-
10.
12.5×0.32×2.5
4.5×26+45×7.4
11.
4296-1296÷12+812 0.4÷(0.3×2-0.4) 2.5×1.25×32
÷(+)× ÷+×7
12.
8×0.27×125 ÷[×(-)]
560÷16÷5 9.47+2.58-3.47 4326÷42×15-45
13.
587﹣169﹣231 +× ×+÷11
0.25×1.25×3.2 ×÷ 36×(+﹣)
14.
18.6-3.89+2.4-6.11 ÷9+× ()×23+
0.4×(2.5×12.5) ×[1÷(-)]
15.
(3618×18-145)×20 66 (21
[)] 3.5×98+35×0.2
16.
44×() 49×()×15
17.
4.4×99+4.4 8×3.7×1.25
18.
37÷4+63 18.7÷0.25÷0.4
3.742.26
19.
(1) (2) (3)
(4) (5) (6)
20.
参考答案:
1.16;;4
=
=1×4×4
=16
=
=
=
=
=
=
=
=
=4
2.156;11;8
2103;32;6
(1)120-180÷15+48
=120-12+48
=108+48
=156
(2)(18)
18
=1+10
=11
(3)0.8×2.7+7.3
=0.8×2.7+7.3×0.8
=0.8×(2.7+7.3)
=0.8×10
=8
(4)3780÷35+19×105
=108+1995
=2103
(5)()×18
=181818
=27+8-3
=35-3
=32
(6)[(]
=[(]
[]
[]
=6
3.3;1
;
7.46-5.75+3.54-2.25
=7.46+3.54-5.75-2.25
=(7.46+3.54)-(5.75+2.25)
=11-8
=3
(
)
1
=1
)
1
[(]
=÷[(+)×]
[]
=×
4.240;
900;43
4.8×[1÷(3.1-3.08)]
=4.8×[1÷0.02]
=4.8×50
=240
=
=
=
=
=
=
=
=900
=
=
=
=43
5.;100;
=
=×(+)
=×1
=
2.5×3.2×12.5
=2.5×0.4×8×12.5
=(2.5×0.4)×(8×12.5)
=1×100
=100
=
=÷
=
6.672;4;0.2
1;360;133
800-800÷25×4
=800-32×4
=800-128
=672
++-
=(+)+(-)
=3+1
=4
1.25×0.5×0.32
=1.25×0.8×0.4×0.5
=1×0.4×0.5
=0.4×0.5
=0.2
(-)÷+
=