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tranvuthoa
2 năm trước
Bài 1: Tìm x ; y ; z biết:a) (2x – 3)2 – 9 = 0 ; b) (3x + 2)3 + 125 = 0 ; c) d. (4x + 2) – (7x+5) = 0 ; e) 3x = 8y và x – y = 15 ; f) 2x = 3y = z và x + y+z = 10 g/ 3: x = x : 27 ; h) 3x = 4y ; x + y = - 14 i/ k/ x2 – x = 0 m/ x2 + x = 0 p/ x3 - 25x = 0 ; q/ x3 + 25x = 0 ; u/ 3x = 4y và x2 + y2 = 25 ; v/ x3 – ( 4x3 + 1 ) = - 1 j/ vaø 2x + 3y - z = -14
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