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用简便方法计算9.87-(9.87加2.5)

9.87-(9.87+2.5) =9.87-9.87-2.5 =-2.5

37.8+4.56-9.87 =37.8+4.56-10+0.13 =(37.8-10)+(4.56+0.13) =27.8+4.69 =27.8+2.2+2.49 =30+2.49 =32.49

=87x(9-6-1) =87x2 =174

方框=-69

101x9.87-9.87 =(101-1)×9.87 =100×9.87 =987

9.87-7.98+0.87简便运算 =9.87+0.87-8+0.02 =10.74-8+0.02 =2.74+0.02 =2.76

9.87乘49减98.7乘3.8加0.987乘90脱式计算,简便方法 9.87x49-98.7x3.8+0.987x90 =9.87x49-9.87x38+9.87x9 =9.78x(49-38+9) =9.87x20 =19.74 希望能帮到你

87×9+87×2-87 =87×(9+2-1) =87×10 =870

8.75*9+8.75*1=8.75*(9+1)=8.75*10=87.5

=(9.87÷0.987)x7.2 =10x7.2 =72

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