(2m²-x²+3x+1)-(5x²-4y²+3x)化简后不含x²项.
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/23 02:18:12
(2m²-x²+3x+1)-(5x²-4y²+3x)化简后不含x²项.(1)求m的值
![(2m²-x²+3x+1)-(5x²-4y²+3x)化简后不含x²项.](/uploads/image/z/15640374-30-4.jpg?t=%EF%BC%882m%26%23178%3B-x%26%23178%3B%2B3x%2B1%EF%BC%89-%EF%BC%885x%26%23178%3B-4y%26%23178%3B%2B3x%EF%BC%89%E5%8C%96%E7%AE%80%E5%90%8E%E4%B8%8D%E5%90%ABx%26%23178%3B%E9%A1%B9.)
解: 原式=2mx^2-x^2+3x+1-5x^2+4y^2-3x
=(2m-6)x^2+4y^2+1
由于此项中不含x^2项
故,它的系数为0
即2m-6=0
解得 m=3
=(2m-6)x^2+4y^2+1
由于此项中不含x^2项
故,它的系数为0
即2m-6=0
解得 m=3
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
(3x-y)²-2x(4x-5y)-(x+2y)²
3m(x-y)-2(y-x)²因式分解
(x+y)-(x+y)平方 因式分解 解方程 2x²=3x (3x-1)² - 4=0 5x-15x
(3)(4x-2y)-[5x-(8y-2x-y)]+x (4)-(2x²-3x-1)-2(x²-3x
已知x²+|y+x|=x-1/4,求(3x+y)²(2x-y)²-(4x²+y&
1、(x-1分之x²)-x-1(因式分解);2、x²(x-y)²-4(y-x)²
计算(2x-3y)²-(4y-3x)(4y+3x) (x+3)²-2(x+5)(x+1)+(x-2)
先化简再求值:(x-2y)²-(x+2y)(x-2y)-(x-3y)(x-y).其中x²+9y
已知关于x的多项式3x^4-(m-5)x³+(n-1)x²-5x+3不含x³和x²
3X(X-3) 999²-1 (2y+3X)² 5X(X+2)-(2X-2)²-X
已知关于x的二次函数y=x²-(2m-1)x+m²+3m+4.