0.85×2.84×50怎么巧算,不要有乱七八糟的,
2个回答
0.85*2.84*50
=0.85*2*0.71*2*50
=1.7*0.71*100
=1.7*71
=1.7*70+1.7*1
=119+1.7
=120.7
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