化简3x^2-1-2x-5+3x-x^2-(2x^2-3)-2(3-2x^2)7a^2b-(-4a^2b+5ab^2)-
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化简
3x^2-1-2x-5+3x-x^2
-(2x^2-3)-2(3-2x^2)
7a^2b-(-4a^2b+5ab^2)-2(2a^2b-3ab^2)
化简求值
6x^4+2x^2y-10+x^4-3x^2y-1 其中x=1 y=-1
2(a^3-2b^2)-(3b^2+a^3)+1 其中a=-2 b=1/3
小林今年M岁,小明币小林小两岁,6年后小明多少岁
3x^2-1-2x-5+3x-x^2
-(2x^2-3)-2(3-2x^2)
7a^2b-(-4a^2b+5ab^2)-2(2a^2b-3ab^2)
化简求值
6x^4+2x^2y-10+x^4-3x^2y-1 其中x=1 y=-1
2(a^3-2b^2)-(3b^2+a^3)+1 其中a=-2 b=1/3
小林今年M岁,小明币小林小两岁,6年后小明多少岁
1.3x^2-1-2x-5+3x-x^2
=2x^2+x-6
=(2x-3)*(x+2)
2.-(2x^2-3)-2(3-2x^2)
=-2x^2+3-6+4x^2
=2x^2-3
3.7a^2b-(-4a^2b+5ab^2)-2(2a^2b-3ab^2)
=7a^2b+4a^2b-5ab^2-4a^2b+6ab^2
=7a^2b+ab^2
=ab(7a+b)
6x^4+2x^2y-10+x^4-3x^2y-1
=7x^4-x^2y-11
=7*1^4-1^2*1-11
=-5
2(a^3-2b^2)-(3b^2+a^3)+1
=a^3-7b^2+1
=(-2)^3-7*(1/3)^2+1
=-70/9
(M-2)+6=M-4
=2x^2+x-6
=(2x-3)*(x+2)
2.-(2x^2-3)-2(3-2x^2)
=-2x^2+3-6+4x^2
=2x^2-3
3.7a^2b-(-4a^2b+5ab^2)-2(2a^2b-3ab^2)
=7a^2b+4a^2b-5ab^2-4a^2b+6ab^2
=7a^2b+ab^2
=ab(7a+b)
6x^4+2x^2y-10+x^4-3x^2y-1
=7x^4-x^2y-11
=7*1^4-1^2*1-11
=-5
2(a^3-2b^2)-(3b^2+a^3)+1
=a^3-7b^2+1
=(-2)^3-7*(1/3)^2+1
=-70/9
(M-2)+6=M-4
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