1/Tính
a)(10x2-15x):5=?
b)(20x3-8x3+10x):(-2x)= ?
c)(2x+3)2=?
d)(3x-1)2=?
2/
a)(x+3)2-x(x+2)=?
b)(2x-1)2+(4x2-6x):2=?
c)(2x+1)2-(2x-3)2=?
d)(3x-1)2-9(x+1)2=?
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