已知a=5x²+2x²-1,b=-3x²-x+5已知a=5x²+2x²-1,b=-3x²-x+5,a+2b=
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已知a=5x²+2x²-1,b=-3x²-x+5已知a=5x²+2x²-1,b=-3x²-x+5,a+2b=
已知a=5x²+2x²-1,b=-3x²-x+5
已知a=5x²+2x²-1,b=-3x²-x+5,a+2b=
已知a=5x²+2x²-1,b=-3x²-x+5已知a=5x²+2x²-1,b=-3x²-x+5,a+2b=
a+2b=5x²+2x-1+2(-3x²-x+5)
=5x²+2x-1-6x²-2x+10
=-x²+9
错了吧:a=5x²+2x²-1还是5x²+2x-1
a+2b=5X2+2X2-1+2(-3X2-X+5)=-X2+10