Toán Lớp 8: câu1: tính
a) x(x-y) + y(x-y)
b) 3x(x^2+ 5) –(3x^2+ 15x +7)
c)2xy(3x^2+ 4x –3y)
d)(4x –3)(x –5) –2x(2x +3)
câu 2: tìm x
a)3x(12x-2) -9x(4x-3) =42
b) (x+4)^2-(x+1)(x-1) = 25
c) x^2+ 3x = 0
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Toán Lớp 8: câu1: tính
a) x(x-y) + y(x-y)
b) 3x(x^2+ 5) –(3x^2+ 15x +7)
c)2xy(3x^2+ 4x –3y)
d)(4x –3)(x –5) –2x(2x +3)
câu 2: tìm x
a)3x(12x-2) -9x(4x-3) =42
b) (x+4)^2-(x+1)(x-1) = 25
c) x^2+ 3x = 0
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