Toán Lớp 8: a) x.(x+5)-3x.(2x-1)
b) x.(x-3)+(x-1)(x+5)
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Toán Lớp 8: a) x.(x+5)-3x.(2x-1)
b) x.(x-3)+(x-1)(x+5)
Giúp mình nha
Comments ( 2 )
=x^2+5x-6x^2+3x
=x^2-6x^2+5x+3x
=-5x^2+8x
=x^2-3x+x^2+5x-x-5
=x^2+x^2-3x+5x-x-5
=2x^2+x-5