42×(-2/3)+(-3/4)÷(0.25)

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42×(-2/3)+(-3/4)÷(0.25)
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42×(-2/3)+(-3/4)÷(0.25)
42×(-2/3)+(-3/4)÷(0.25)

42×(-2/3)+(-3/4)÷(0.25)
先算乘除、后算加减.把小数化成整数计算.
原式=42×(-2/3)—(3/4)÷(1/4)
= -28- (3/4)×4 除以一个数,就等于乘以这个数的倒数
=-28-3
=-31

-31
先算乘除 后算加减
42*(-2/3)=-84/3=-28
-3/4÷0.25=-3/4÷1/4=-3/4*4=-3
-28+(-3)=-31

42×(-2/3)+(-3/4)÷(0.25)
=14*3*(-2/3)+(-3/4)÷(1/4)
=14*(-2)+(-3/4)*4
=-28-3
=-31