8.7x57.2+3x5.72+572x0.1
=8.7x57.2+0.3x57.2+1x57.2
=(8.7+0.3+1)x57.2
=10x57.2
=572
8.7×57.2+3×5.72+572×0.1
=8.7×57.2+0.3×57.2+57.2×1
=57.2×(8.7+0.3+1)
=572
8.7乘以57.2+3乘以5.72+572乘以0.1=
87乘以5.72+3乘以5.72+10乘以5.72=
（87+3+10）乘以5.72
=100乘以5.72
=572
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