初中数学题(整式的加减)(m+2n)-(m-2n)(2ab+5a²-2b²)-(a²+2ab-2b²)2x-3(x-2y+3z)+2(3x-3y+2z)8m²-[4m²-2m-(2m²-5m)]
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![初中数学题(整式的加减)(m+2n)-(m-2n)(2ab+5a²-2b²)-(a²+2ab-2b²)2x-3(x-2y+3z)+2(3x-3y+2z)8m²-[4m²-2m-(2m²-5m)]](/uploads/image/z/4033697-41-7.jpg?t=%E5%88%9D%E4%B8%AD%E6%95%B0%E5%AD%A6%E9%A2%98%EF%BC%88%E6%95%B4%E5%BC%8F%E7%9A%84%E5%8A%A0%E5%87%8F%EF%BC%89%EF%BC%88m%2B2n%EF%BC%89-%EF%BC%88m-2n%EF%BC%89%EF%BC%882ab%2B5a%26sup2%3B-2b%26sup2%3B%EF%BC%89-%EF%BC%88a%26sup2%3B%2B2ab-2b%26sup2%3B%EF%BC%892x-3%EF%BC%88x-2y%2B3z%29%2B2%EF%BC%883x-3y%2B2z%EF%BC%898m%26sup2%3B-%5B4m%26sup2%3B-2m-%EF%BC%882m%26sup2%3B-5m%EF%BC%89%5D)
初中数学题(整式的加减)(m+2n)-(m-2n)(2ab+5a²-2b²)-(a²+2ab-2b²)2x-3(x-2y+3z)+2(3x-3y+2z)8m²-[4m²-2m-(2m²-5m)]
初中数学题(整式的加减)
(m+2n)-(m-2n)
(2ab+5a²-2b²)-(a²+2ab-2b²)
2x-3(x-2y+3z)+2(3x-3y+2z)
8m²-[4m²-2m-(2m²-5m)]
初中数学题(整式的加减)(m+2n)-(m-2n)(2ab+5a²-2b²)-(a²+2ab-2b²)2x-3(x-2y+3z)+2(3x-3y+2z)8m²-[4m²-2m-(2m²-5m)]
(m+2n)-(m-2n)
=m+2n-m+2n
=4n
(2ab+5a²-2b²)-(a²+2ab-2b²)
=2ab+5a²-2b²-a²-2ab+2b²
=4a²
2x-3(x-2y+3z)+2(3x-3y+2z)
=2x-3x+6y-9z+6x-6y+4z
=5x-5z
8m²-[4m²-2m-(2m²-5m)]
=8m²-[4m²-2m-2m²+5m]
=8m ²-[2m²+3m]
=6m²-3m
(m+2n)-(m-2n)=m+2n-m+2n=4n
(2ab+5a²-2b²)-(a²+2ab-2b²)=2ab+5a²-2b²-a²-2ab+2b²=4a²
2x-3(x-2y+3z)+2(3x-3y+2z)=2x-3x+6y-9z+6x-6y+4z=5x-5z
8m²-[4m²-2m-(2m²-5m)]=8m²-4m²+2m+2m²-5m=6m²-3m
1.原式=m+2n-m+2n=4n
2.原式=2ab+5a2-2b2-a2-2ab+2b2=4a2
3.原式=2x-3x+6y-9z+6x-6y+4z=5x-5z
4.原式=8m2-4m2+2m+2m2-5m=6m2+2m
1.-b的立方+5a-2a的平方b+a的立方b 2.2x右上角m-1的次方+y 因为事一次式,所以m-1=0 m=1 (-m)^n=1当n事偶数 当n是奇数时得-1 3.