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1. Tính:
a) 2x*(2x^2-3x+5)+6x^2
b) (2+x)*(2-x)-4
c) (x+5)^2-10x
2. Tìm x, biết:
a) 3*(x^2-2x+1)=3x^2+3
b) (3-x)^2-(x-1)*(2+x)=0


1 Tính A 2x2x23x56x2 B 2x2x4 C X5210x 2 Tìm X Biết A 3x22x13x23 B 3x2x12x0 class=