1、计算(1)2/m+1/m (2)3b/xy-b/xy (3)(a/a+b)+b/a+b (4)(5x/2x-y)-x
来源:学生作业帮 编辑:百度作业网作业帮 分类:数学作业 时间:2024/08/19 09:24:10
1、计算
(1)2/m+1/m (2)3b/xy-b/xy (3)(a/a+b)+b/a+b (4)(5x/2x-y)-x+2y/2x-y
2、计算:
(1)2/-mn+10/mn (2)(2/x-1)-3/1-x
(3)(x+3/x+1)-(x-1/x+1)+x-2/x+1 (4)(t+4k/9k²-4t²)+k-t/4t²-9k²
注明:这里的/都表示分数线,每题至少2部.
3、先化简,再求值:y平方/y-2+4/2-y,其中y=-9/2
(1)2/m+1/m (2)3b/xy-b/xy (3)(a/a+b)+b/a+b (4)(5x/2x-y)-x+2y/2x-y
2、计算:
(1)2/-mn+10/mn (2)(2/x-1)-3/1-x
(3)(x+3/x+1)-(x-1/x+1)+x-2/x+1 (4)(t+4k/9k²-4t²)+k-t/4t²-9k²
注明:这里的/都表示分数线,每题至少2部.
3、先化简,再求值:y平方/y-2+4/2-y,其中y=-9/2
![1、计算(1)2/m+1/m (2)3b/xy-b/xy (3)(a/a+b)+b/a+b (4)(5x/2x-y)-x](/uploads/image/z/2277482-50-2.jpg?t=1%E3%80%81%E8%AE%A1%E7%AE%97%EF%BC%881%EF%BC%892%2Fm%2B1%2Fm+%EF%BC%882%EF%BC%893b%2Fxy-b%2Fxy+%EF%BC%883%EF%BC%89%EF%BC%88a%2Fa%2Bb%EF%BC%89%2Bb%2Fa%2Bb+%EF%BC%884%EF%BC%89%EF%BC%885x%2F2x-y%EF%BC%89-x)
(1)2/m+1/m =(2+1)/m=3/m
(2)3b/xy-b/xy=(3b-b)/xy=2b/xy
(3)(a/a+b)+b/a+b=(a+b)/(a+b)=1
(4)(5x/2x-y)-x+2y/2x-y=(5x-x-2y)/(2x-y)=(4x-2y)/(2x-y)=2(2x-y)/(2x-y)=2
(1)2/-mn+10/mn =(-2+10)/mn=8/mn
(2)(2/x-1)-3/1-x=2/(x-1)+3/(x-1)=(2+3)/(x-1)=5/(x-1)
(3)(x+3/x+1)-(x-1/x+1)+x-2/x+1=(x+3-x+1+x-2)/(x+1)=(x+2)/(x+1)
(4)(t+4k/9k²-4t²)+k-t/4t²-9k²
=(t+4k)/(9k²-4t²)+(t-k)/(9k²-4t²)
=(t+4k+t-k)/(9k²-4t²)
=(2t+3k)/(3k-2t)(3k+2t)
=1/(3k-2t)
(2)3b/xy-b/xy=(3b-b)/xy=2b/xy
(3)(a/a+b)+b/a+b=(a+b)/(a+b)=1
(4)(5x/2x-y)-x+2y/2x-y=(5x-x-2y)/(2x-y)=(4x-2y)/(2x-y)=2(2x-y)/(2x-y)=2
(1)2/-mn+10/mn =(-2+10)/mn=8/mn
(2)(2/x-1)-3/1-x=2/(x-1)+3/(x-1)=(2+3)/(x-1)=5/(x-1)
(3)(x+3/x+1)-(x-1/x+1)+x-2/x+1=(x+3-x+1+x-2)/(x+1)=(x+2)/(x+1)
(4)(t+4k/9k²-4t²)+k-t/4t²-9k²
=(t+4k)/(9k²-4t²)+(t-k)/(9k²-4t²)
=(t+4k+t-k)/(9k²-4t²)
=(2t+3k)/(3k-2t)(3k+2t)
=1/(3k-2t)
1、计算(1)2/m+1/m (2)3b/xy-b/xy (3)(a/a+b)+b/a+b (4)(5x/2x-y)-x
化简分式;(1)3xy/42x-3xy(2)a-b/a²-b²(3)x²+2xy+y
求大手啊6xy[x^2(5x+3)-3x^2(-4y)] 还有 [(a+b)(a-b)-(a-b)^2]除以4b 还有[
已知a.b互为相反数,x.y互为倒数,m的绝对值为1,求代数式m^2-xy+(a+b)/m的值
因式分解2x²y-xy-3y (-a+b)+c²(a-b)
(1)、已知A=3x^2 y-2xy^2+4xy,B=5xy^2-3xy+x^2 y,且A+B+2C=0,求C.
(1)16-(2a+3b)²(2)-36x²+12xy-y²(3)4x(a-b)-8y(b
(1).设A=2X²-3Xy+y²+X-3y,B=4X²-6xy+2y²+4X-
(1)4x²-(1/4)y² (2)8xy-x²-16y² (3)2m(a-b)
(-3a+2b)(a-2b-1)+4a平方+2a,(x+y)(x的平方-xy+y的平方 )
(x-A)*(B-y)=x^2-9xy+8y^2,求A,B
已知m是最小的自然数,且(-2a的m+2次方)·(b的1+y次方)与5a^x×b^3是同类项,求2x^2-3xy+6y^