Toán Lớp 8: 6x^2 -(2x+3)(3x-2)=7
5x(12+7)-3x(80x-5)=-100
(3x-5)(7-5x)-(5x-2)(2-3x)=4
Giải pt
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Toán Lớp 8: 6x^2 -(2x+3)(3x-2)=7
5x(12+7)-3x(80x-5)=-100
(3x-5)(7-5x)-(5x-2)(2-3x)=4
Giải pt
Comments ( 1 )
* 6x^2- (2x+3)(3x-2)=7
=>6x^2 – (6x^2 -4x+9x-6)=7
=> 6x^2 – 6x^2 +4x -9x+6=7
=> -5x=1
=> x= -1/5
*5x(12+7)-3x(80x-5)=-100
=> 95x-240x +15x=-100
=> -130x=-100
=> x=10/13