Toán Lớp 7: x/5= y/7va y-x = 18 thi gia tri cua x la
A.-45 B.45 C.63 D.-63
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Toán Lớp 7: x/5= y/7va y-x = 18 thi gia tri cua x la
A.-45 B.45 C.63 D.-63
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