原式=6.5×0.64-6.5×0.54+6.5×0.99
=6.5×（0.64-0.54+0.99）
=6.5×1.09
=7.085
0.65*6.4-6.5*0.54+6.5*0.99用简便运算怎么算
2个回答
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0.65乘以6.4减6.5乘以0.54加65乘以9％