40乘以0.2x减0.25x=7怎么算?
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![40乘以0.2x减0.25x=7怎么算?](/uploads/image/z/3696553-1-3.jpg?t=40%E4%B9%98%E4%BB%A50.2x%E5%87%8F0.25x%3D7%E6%80%8E%E4%B9%88%E7%AE%97%3F)
40乘以0.2x减0.25x=7怎么算?
40乘以0.2x减0.25x=7怎么算?
40乘以0.2x减0.25x=7怎么算?
40*0.2x-0.25x=7
8x-0.25x=7
7.75x=7
31/4x=7
x=7*4/31
x=28/31
40乘以0.2x-0.25x=7
8x-0.25x=7
(8-0.25)x=7
7.75x=7
x=7÷7.75
x=28/31
40乘以0.2x减0.25x=7
8x-0.25x=7
7.75x=7
x=7/7.75=0.9
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