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(╳)÷4.5=20

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

92.25

x/4-x/4.5=10 4.5x-4x=180 0.5x=180 x=360

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

=1.2÷1.2×2.3÷2.3×3.4÷3.4×4.5 =1×4.5 =4.5

×÷4.5=1.2 解:×÷4.5×4.5=1.2×4.5 ×=5.4

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

你这是简算吗? 47/20 ÷ [ 19/4 - 4.5 ×(20%+1/3)] = 47/20 ÷ [ 19/4 - 4.5 × 20% - 4.5×1/3 ] = 47/20 ÷ [ 19/4 - 0.9 - 1.5] = 47 ÷ [20 ×(19/4 - 0.9 - 1.5)] = 47 ÷ [5 × 19 - 20 × 0.9 - 20 × 1.5] = 47 ÷ [95 - 18 - 30] = 47 ÷ 47 =1

2又7/20÷[5又3/4-4.5×(20% +1/3)] =2又7/20÷[5又3/4-4.5×8/15] =2又7/20÷[5又3/4-2.4] =2又7/20÷2.35 =1

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