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若式子12-9(3-X)與4(5/4X-5)的值相等,[4分之5乘X?=5X/4] 則12-9(3-X)=4(5X/4-5) 12-27+9X=5X-20 9X-5X=-20+27-12 4X=-5 X=-5/4.
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