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laanhthien20
2 năm trước
bài 1 tìm x a, ( X x 7 + 8 ) : 5 =10 b, 9,15 x X + 2,85 x X = 48 bài 2 tính nhanh a, ( 532 x 7 - 266 x14 ) x ( 532 x 7 + 266 ) b, 117 x ( 36 + 62 ) - 17 x ( 62 + 36 )
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