Question

小学数学脱式计算，不要直接答案，要详细过程。也可以写在纸上，谢谢哟

Answer 1

8.7×10.1
=8.7×(10+0.1)
=87+0.87
=87.87

7.06×2.4-5.7
=7.06×0.8×3-1.9×3
=3×(7.06×0.8-1.9)
=3×(5.648-1.9)
=3×3.748
=11.244

2.5×6.8×0.4
=2.5×0.4×6.8
=1×6.8
=6.8

2.5×3.2×1.25
=2.5×4×0.8×1.25
=1×1
=1

追问

最好一道错了

后

追答

2.5×4=10
2.5×3.2×1.25
=2.5×4×0.8×1.25
=10×1
=10

Answer 2

8.7x10.1=8.7x(10+0.1)=87+0.87=87.87
7.06x2.4-5.7=(7+0.06)x2.4-5.7=16.8+0.144-5.7=11.244
2.5x6.8x0.4=2.5x0.4x6.8=1x6.8=6.8
2.5x3.2x1.25=(2.5x0.4)x(8x1.25)=1x10=10