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Bài 4: Tìm x: X x 4/7 = 8/3 b. 2/5 : x = 1/3 c.x : 7/11 = 22 *, Tìm y ? 8/(7 ) - y x 2/(3 ) = b. y x 4/6 + = 7/8 c. y x 2/3 + 5/4= 20/14.
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