先：
12.5 x 0.8 = 10
2.5 x 40 = 100
接着
0.8 x 7 x 10 = 56
0.02 x 100 = 2
最后
2 x 56 = 112
12.5×0.02×0.8×2.5×7×40×0.8托式计算
1个回答
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