1.已知a+b=2009,求代数式2010-b-a的值2.已知A=-3x+2,B=2x-5,求(1)2A+B,(2)A-3B.3.(1)4x-(3x-y) (2)(a²-b²)-2(a²+b²)最快的时间回答正确的我给悬赏50
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![1.已知a+b=2009,求代数式2010-b-a的值2.已知A=-3x+2,B=2x-5,求(1)2A+B,(2)A-3B.3.(1)4x-(3x-y) (2)(a²-b²)-2(a²+b²)最快的时间回答正确的我给悬赏50](/uploads/image/z/5261102-62-2.jpg?t=1.%E5%B7%B2%E7%9F%A5a%2Bb%3D2009%2C%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8F2010-b-a%E7%9A%84%E5%80%BC2.%E5%B7%B2%E7%9F%A5A%3D-3x%2B2%2CB%3D2x-5%2C%E6%B1%82%EF%BC%881%EF%BC%892A%2BB%2C%EF%BC%882%EF%BC%89A-3B.3.%EF%BC%881%EF%BC%894x-%EF%BC%883x-y%EF%BC%89+%EF%BC%882%EF%BC%89%EF%BC%88a%26sup2%3B-b%26sup2%3B%EF%BC%89-2%EF%BC%88a%26sup2%3B%2Bb%26sup2%3B%EF%BC%89%E6%9C%80%E5%BF%AB%E7%9A%84%E6%97%B6%E9%97%B4%E5%9B%9E%E7%AD%94%E6%AD%A3%E7%A1%AE%E7%9A%84%E6%88%91%E7%BB%99%E6%82%AC%E8%B5%8F50)
1.已知a+b=2009,求代数式2010-b-a的值2.已知A=-3x+2,B=2x-5,求(1)2A+B,(2)A-3B.3.(1)4x-(3x-y) (2)(a²-b²)-2(a²+b²)最快的时间回答正确的我给悬赏50
1.已知a+b=2009,求代数式2010-b-a的值
2.已知A=-3x+2,B=2x-5,求(1)2A+B,(2)A-3B.
3.(1)4x-(3x-y) (2)(a²-b²)-2(a²+b²)
最快的时间回答正确的我给悬赏50
1.已知a+b=2009,求代数式2010-b-a的值2.已知A=-3x+2,B=2x-5,求(1)2A+B,(2)A-3B.3.(1)4x-(3x-y) (2)(a²-b²)-2(a²+b²)最快的时间回答正确的我给悬赏50
2010-b-a=-(a+b-2010)=1
1.1
2.2A+B=-4x-1 A-3B=-9x+17
3.1)x+y
2)-a²-3b²
2010-b-a
=2010-(a+b)
=2010-2009
=1
1.2010-b-a=2010-(a+b)=2010-2009=1
2.2A+B=6X+4+2X-5=8X-1 A-3B=3X+2-6X+15=-3X+17
3(1) 4X-3X+Y=X+Y (2) a2-b2-2a2-2b2=-a2-3b2
1.2010-b-a=2010-(a+b)
=2010-2009
=1
2.(1) 2A+B=2*(-3x+2)+2x-5
=-6x+4+2x-5
=-4x-1
(2)A-3B=-3x+2-3*(2x-5)
=-3x+2-6x+15
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1.2010-b-a=2010-(a+b)
=2010-2009
=1
2.(1) 2A+B=2*(-3x+2)+2x-5
=-6x+4+2x-5
=-4x-1
(2)A-3B=-3x+2-3*(2x-5)
=-3x+2-6x+15
=-3x+17
3.(1)原式=4x-3x+y
=x+y
(2)原式=a²-b²- 2a²-2b²
=-a²-3b²
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