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138乘25乘4的简便方法 脱式计算

13.8x0.45+138x0.055 =13.8x0.45+13.8x0.55 =13.8x(0.45+0.55) =13.8x1 =13.8

138+(27+48)/25 =138+75/25 =138+3 =141

75加[138除(100减58)]的脱式计算 =75+【138÷42】 =75+3.28… =78.28… 138÷42得数是无限小数

(138+618)÷84 =756÷84 =9

245+362+138+55脱式计算 245+362+138+55 =(245+55)+(362+138) =300+500 =800

=69×5 =345

(932一138)亠8脱式计算 解: (932一138)÷8 =794÷8 =99.25

138÷6+35×7 =23+245 =268

138+499 =138+500-1 =638-1 =637

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