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x÷4.5=1.2

×÷4.5=1.2 解:×÷4.5×4.5=1.2×4.5 ×=5.4

x=1.2×4.5 x=5.4

x等于 1.2x4.5 等于5.4

-x=-5 x=5

4.5x1.2-3.15÷15 =4.5+0.9-0.21 =5.4-0.21 =5.19

4.5÷0.25-0.75x1.2 =4.5÷(0.25x4/4)-0.75x(4x0.3) =4.5÷(1/4)-(0.75x4)x0.3 =4.5x4-3x0.3 =18-0.9 =18.9

4.5÷[(1/2-3÷7.5)×18/5] =4.5÷[(1/2-2/5)×18/5] =4.5÷(1/10×18/5) =4.5÷9/25 =9/2×25/9 =25/2

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