Question

0.8×720×0.125 0.25×32×0.125 5.9×2.7＋3.57 42-3.8×5.9 12.5×4.8 43.2-1.8×3-4.6 简便计算

五年级上册简便计算

Answer 1

0.8×720×0.125 0.25×32×0.125 5.9×2.7＋3.57 42-3.8×5.9
=0.8×0.125×720 =(0.25×4)×(8×0.125) =(6-0.1)×2.7+3.57 =42-3.8×(5+0.9)
=0.1×720 =1×1 =16.2-0.27+3.57 =42-3.8×5-3.8×0.9
=72 =1 =19.5 =42-19-2.34
12.5×4.8 43.2-1.8×3-4.6 =19.58
=12.5×8×0.6 =43.2-5.4-4.6
=100×0.6 =43.2-(5.4+4.6)
=60 =43.2-10
=33.2
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Answer 2

0.8×720×0.125 =0.8* 1/8 *720=72
0.25×32×0.125 =0.25×4×8×0.125=1×1=1
5.9×2.7＋3.57 =(6-0.1)×2.7+3.57=16.2-0.27+3.57=19.5
42-3.8×5.9 =42-(4-0.2)×(6-0.1)=42-24+0.4+1.2-0.02=29.58
12.5×4.8 =12.5×8×0.6=60
43.2-1.8×3-4.6 =43.2-5.4-4.6=43.2-10=33.2

Answer 3

0.8×720×0.125=0.8x720x1/8=72
0.25×32×0.125=1/4x32x1/8=1
5.9×2.7＋3.57=5.9×2.7+0.27+3.3=(5.9+0.1)x2.7+3.3=19.5
42-3.8×5.9同上道理
12.5×4.8=12.5x(4+0.8)
43.2-1.8×3-4.6=43.2-(2-0.2)x3-4.6=43.2-6+0.6-4.6=33.2

Answer 4

第一题，先用0.8x0.125,最后得72
第二题，将32=4x8化开再去乘，最后得1
第三题，原式=5.9x3x0.9+3x1.19，先算出5.9x0.9,再用乘法分配律逆运算，最后得19.5
第四题，将5.9=5+0.9拆开，算出3.8x(5+0.9),再算整体，得19.58
第五题，原式=12.5x8x0.6得60
第六题，先算（1.8x3+4.6)得10，最后得33.2