小数乘法 简便计算（专项训练）-2024-2025学年五年级上册数学人教版

人教版 五年级数学上册 简便计算 56×1.25 1.25+4.6+0.75 2.02x8.5 $25×0.7×08 9.8x25 $$6. ×3.6+36×3$ 2.96x40 1.6×7.5×1.25 0.8x0.25×0.4×12.5 (1.25+2.5)x0.8 0.36×42+0.36x58 (25-2.5)×0.4 74×028+028×2 7.9+0.46-09+0.54 3.9x10.1 人教版 五年级数学上册 4.96×12.5-4.96t2. 12.5×8.88 3.8 4.7+3.8×6.3-3.8 444×96+222×0$ 099×222+333×334 6.5×101-6.5 $1 22+0.22×3300+660×2.2 999.9x0.28-0.6666x370 $25×002x08×25×7x40×05 4.7x2.6+0.47x43+47x0.31 4.82×0.59+0.41×159-0.323×5 1.22.5-3×0.25-50×0.025 人教版 五年级数学上册 简便计算(解析) 56×1.25 1.25+4.6+0.75 2.02×8.5 =(2+0.02)x8.5 =125+0.75+4.6 =7x(8x1.25) =2 8.5+0.02x8.5 -6.6 -70 =17.17 1.25×0.7×0.8 9.8x25 6. 1$3.6+3.6×3.9 =(10-0.2)x25 =1025-02$25$ =125×0.8×0.7 =3.6×(6.1+3.9) -0.7 -245 =36 2.96x40 1.6×7.5×1.25 0.8×0.25×0.4×125 =(3-0.04)x40 =0.8x2×7.5×1.25 =3×40-004×4 =(0.8×1.25)x(2×7.5) =(0.8×12.5)×(0.25×0.4) -15 =118.4 -1 (1.25+2.5)×0.8 0.36×42+0.36x58 (25-2.5)x0.4 =0.36x(42+58) -125×08+25×0$ =25×0.4-2.5×0 -3 -36 -9 7.9+0.46-0.9+0.54 74×0.28+028×2 3.9x10.1 =3.9×(10+0.1) =0.28x(7.4+2.6) =(7.9-0.9)+(0.46+0.54) =3.9x10+3.9x0.1 -8 -2.8 -39.39 n 人教版 五年级数学上册 4.96×12.5-4.96×2.5 12.5x8.88 3.8×47+3.8×63-3$ =4.96×(12.5-2.5) =125x8×11 =3.8×(47+63-1 -49.6 =111 -38 44.4×9.6+22.2×0.8 99.9×222+333×33.4 6.5×101-6.5 =44.4×9.6+44.4×0 =33.3×666+33.3×334 =33.3×(666+334) =44.4×(9.6+0.4) =6.5×(101-1 -444 =33300 -650 $2+0.22x3300+660×2.2$ $0909.9×0.28-06666x37 =2 2+22x33+22x66$ =22×(1+33+66) =3333×0.84-3333×074 -2200 =33.33 12.5×0.02x0.8×2.5x7x40×0.5 4.7x2.6+0.47x43+47×0.31 =(12.5×0.8)×(0.02×0.5)x(2.5×40) =4.7x2.6+4.7x4.3+4.7×3.1 =10×0.01×100 =4.7x(2.6+4.3+3.1) -10 -47 4.82x0.59+0.41x1.59-0.3235.9 $2 2.5-3×0.25-50×0.025 人教版 五年级数学上册 -482t059-323t059+04115$ =(4.82-3.23)x0.59+0.41x1.59 =1.59x0.59+0.41x1.59 =1.2x2.5-0.3x2.5-0.5×2.5 =1.59×(0.59+0.41) =(12-0.3-0.5)x2.5 -1.59 =1 1