Question

5.4×3.2+7.6×2.4可有简便算法？

Answer 1

简便算法如下：
5.4×3.2+7.6×2.4
=5.4×3.2+（4.6+3）×2.4
=5.4×3.2+4.6×2.4+3×2.4
=5.4×（2.4+0.8）+4.6×2.4+3×2.4
=5.4×2.4+5.4×0.8+4.6×2.4+3×2.4
=（5.4+4.6）×2.4+5.4×0.8+3×2.4
=24+11.52
=35.52

Answer 2

5.4×3.2+7.6×2.4
=5.4×0.4×8+7.6×0.3×8
=2.16×8+2.28×8
=(2.16+2.28)×8
=4.44×8
=35.52

Answer 3

5.4×3.2 + 7.6×2.4
=1.8x3x3.2 + 1.9x4x2.4
=1.8x9.6 + 1.9x9.6
【提取公因数9.6】
=9.6x(1.8+1.9)
=9.6x3.7
=(10-0.4)x3.7
=37-1.48
=35.52