102减去48乘0.85的积，得的差除以一个数得122.4，求这个数是多少？用方程解哦、感谢万分

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设这个数为 x ，则(102 - 48 × 0.85) ÷ x = 122.4(102 - 40.8) ÷ x = 122.461.2 ÷ x = 122.4x = 61.2 ÷ 122.4x = 0.5

千问 | 2010-12-7 17:59:38 | 显示全部楼层

假如数为 t，所以(102 - 48 × 0.85) ÷ t = 122.4
(102 - 40.8) ÷ t = 12 61.2 ÷ t = 122.4
t= 61.2 ÷ 122.4
t = 0.5

千问 | 2010-12-7 17:59:38 | 显示全部楼层

设这个数为 x ，则(102 - 48 × 0.85) ÷ x = 122.4(102 - 40.8) ÷ x = 122.461.2 ÷ x = 122.4x = 61.2 ÷ 122.4x = 0.5

千问 | 2010-12-7 17:59:38 | 显示全部楼层

设这个数为x（102-48*0.85）\x=122.4，得出该数为0.5~

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