Toán Lớp 8: (x bình – 1 + x ) nhân ( x bình – 1 + 3 x )+ x bình
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Toán Lớp 8: (x bình – 1 + x ) nhân ( x bình – 1 + 3 x )+ x bình
Comments ( 2 )
= x^4 -x^2 +3x^3-x^2-1-3x+ x^3 -x+3x^2+x^2
=x^4 +(3x^3 + x^3) +(-x^2 -x^2 +3x^2 +x^2) +(-x-3x) -\+1
= x^4 + 4x^3 + 2x^2 -4x +1