x/42× 4/5=（x-100）/40
2/21x=(x-100)/8
16x=21x-2100
5x=2100
x=420
x/42× 4/5=（x-100）/40 怎么算 快,越快越好,有分的
x/42× 4/5=（x-100）/40 怎么算 快,越快越好,有分的
數(shù)學(xué)人氣：887 ℃時(shí)間：2020-07-25 11:37:22
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