Toán Lớp 8: tìm x biết
a)(4x-1)² -(3x+2).(3x-2)=(7x-1).(x+2)+(2x+1)² -(4x²+7)
b)(2x+3)² -(5x-4).(5x+4)=(x+5)² -(3x-1).(7x+2)-(x²-x+1)
GIÚP MK VS Ạ!!!
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Toán Lớp 8: tìm x biết
a)(4x-1)² -(3x+2).(3x-2)=(7x-1).(x+2)+(2x+1)² -(4x²+7)
b)(2x+3)² -(5x-4).(5x+4)=(x+5)² -(3x-1).(7x+2)-(x²-x+1)
GIÚP MK VS Ạ!!!
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