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(╳)÷4.5=20

解 x-10=20×4.5 x-10=90 x=10+90 x=100

2又20分之7÷[5又4分之3-4.5×(20%+3分之1)] =2又20分之7÷(5又4分之3-4.5×20% - 4.5x3分之1) =2.35÷(5.75-0.9-1.5) =2.35÷3.35 =47/67

x=1.2×4.5 x=5.4

4.5X4.5÷4.5×4.5 =(4.5÷4.5)×(4.5×4.5) =1÷20.25 =20.25

18÷4.5÷20简便计算 =18÷(4.5x20) =18÷90 =0.2

38÷1.3,3.62╳0.06的竖式计算分别如下:

20.7÷4.5=4.6 4.6 ————— 45 )207 180 ————— 270 270 ————— 0

2.05÷4.5 =20.5÷45 =0.45(5上面点个点,表示5循环) 竖式见图:

用竖式计算并求未知数x.0.25×1.6; &n...(1)0.25×1.6=0.4;(2)4.5x-1.5×2=6 4.5x-3=6 4.5x-3+3=6+3 4.5x=9 4.5x÷4.5=9÷4.5 x=20(3)...

6x=24 x=24÷6 x=4 4.5x=90 x=90÷4.5 x=20 0.8x=9.6 x=9.6÷0.8 x=12 x÷3=12 x=12*3 x=36 y÷2.8=11 y=11*2.8 y=30.8

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