帮忙看一下这题怎么做?
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8.74×1.4+86×0.874
=8.74×1.4+8.6×8.74
=(1.4+8.6)x8.74
=10x8.74
=87.4
3.5×1.6+3.5×0.4-3.5
=(1.6+0.4-1)x3.5
=1×3.5
=3.5
=8.74×1.4+8.6×8.74
=(1.4+8.6)x8.74
=10x8.74
=87.4
3.5×1.6+3.5×0.4-3.5
=(1.6+0.4-1)x3.5
=1×3.5
=3.5
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