8.6X7.4+0.86X26
=8.6X7.4+8.6X2.6
=8.6X(7.4+2.6)
=8.6X10
=86
8.6*7.4+0.86*26=0.86*74+0.86*26=0.86*（74+26）=0.86*100=86
这题很简单的:8.6×7.4＋0.86×26
＝0.86×10×7.4＋0.86×26
＝0.86(74＋26)
＝0.86×100
＝86
7.6*0.8+0.2*7.6
=7.6*(0.8+0.2)
=7.6*1
=7.6
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