1、(2a²b-5ab)-2(-ab-a²b) 2、1-3(x-2分之1y²)+(-x+2分之1y²)3、7(P三次方+P²-P-1)-2(P三次方+P) 4、-(3分之1+m²n+m三次方)-(3分之2-m²n-m三次方)
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/06 22:10:38
![1、(2a²b-5ab)-2(-ab-a²b) 2、1-3(x-2分之1y²)+(-x+2分之1y²)3、7(P三次方+P²-P-1)-2(P三次方+P) 4、-(3分之1+m²n+m三次方)-(3分之2-m²n-m三次方)](/uploads/image/z/15223408-16-8.jpg?t=1%E3%80%81%EF%BC%882a%26%23178%3Bb-5ab%29-2%28-ab-a%26%23178%3Bb%29+2%E3%80%811-3%EF%BC%88x-2%E5%88%86%E4%B9%8B1y%26%23178%3B%EF%BC%89%2B%EF%BC%88-x%2B2%E5%88%86%E4%B9%8B1y%26%23178%3B%EF%BC%893%E3%80%817%EF%BC%88P%E4%B8%89%E6%AC%A1%E6%96%B9%2BP%26%23178%3B-P-1%29-2%28P%E4%B8%89%E6%AC%A1%E6%96%B9%2BP%29+4%E3%80%81-%EF%BC%883%E5%88%86%E4%B9%8B1%2Bm%26%23178%3Bn%2Bm%E4%B8%89%E6%AC%A1%E6%96%B9%29-%283%E5%88%86%E4%B9%8B2-m%26%23178%3Bn-m%E4%B8%89%E6%AC%A1%E6%96%B9%EF%BC%89)
1、(2a²b-5ab)-2(-ab-a²b) 2、1-3(x-2分之1y²)+(-x+2分之1y²)3、7(P三次方+P²-P-1)-2(P三次方+P) 4、-(3分之1+m²n+m三次方)-(3分之2-m²n-m三次方)
1、(2a²b-5ab)-2(-ab-a²b) 2、1-3(x-2分之1y²)+(-x+2分之1y²)
3、7(P三次方+P²-P-1)-2(P三次方+P) 4、-(3分之1+m²n+m三次方)-(3分之2-m²n-m三次方)
1、(2a²b-5ab)-2(-ab-a²b) 2、1-3(x-2分之1y²)+(-x+2分之1y²)3、7(P三次方+P²-P-1)-2(P三次方+P) 4、-(3分之1+m²n+m三次方)-(3分之2-m²n-m三次方)
1、(2a²b-5ab)-2(-ab-a²b)
=2a²b-5ab+2ab+2a²b
=4a²b-3ab
2、1-3(x-2分之1y²)+(-x+2分之1y²)
=1-3x+2分之3y²-x+2分之1y²
=2y²-4x+1
3、7(P三次方+P²-P-1)-2(P三次方+P)
=7P三次方+7P²-7P-7-2P三次方-2P
=5P三次方+7P²-9P-7
4、-(3分之1+m²n+m三次方)-(3分之2-m²n-m三次方)
=-3分之1-m²n-m三次方-3分之2+m²n+m三次方
=-1
(2a²b-5ab)-2(-ab-a²b)
=2a²b-5ab+2ab+2a²b
=4a²b-3ab
1-3(x-2分之1y²)+(-x+2分之1y²)
=1-3x+(3/2)y²-x+(1/2)y²
=1+y²-4x
7(P三次方+P...
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(2a²b-5ab)-2(-ab-a²b)
=2a²b-5ab+2ab+2a²b
=4a²b-3ab
1-3(x-2分之1y²)+(-x+2分之1y²)
=1-3x+(3/2)y²-x+(1/2)y²
=1+y²-4x
7(P三次方+P²-P-1)-2(P三次方+P)
=7P^3+7P²-7P-7-2P^3+2P
=5P^3+7P²-5P-7
-(3分之1+m²n+m三次方)-(3分之2-m²n-m三次方)
=-(1/3)-m²n-m^3-2/3+m²n+m^3
=-1
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