80—(6.83十3.27)x7.9用简便计算
6 2.6x6.83 =2.6x(3.7 6.83) =2.6x10.53 =2.6x(10 0.5 0.03) =26 1.
25-6.83 0.75的简便运算
los botones, la construcción, todo es muy bueno, excelente
80-17.89066.83-21.
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