7.7*0.9+9*0.23简便方法怎么算?
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7.7*0.9+9*0.23简便方法怎么算?
7.7*0.9+9*0.23简便方法怎么算?
7.7*0.9+9*0.23简便方法怎么算?
7.7×0.9+9×0.23
=7.7×0.9+0.9×2.3
=0.9×(7.7+2.3)
=0.9×10
=9
7.7*0.9+9*0.23简便方法怎么算?
7.7*0.9+9*0.23简便方法怎么算?
7.7*0.9+9*0.23简便方法怎么算?
7.7×0.9+9×0.23
=7.7×0.9+0.9×2.3
=0.9×(7.7+2.3)
=0.9×10
=9