x____时,分式2x+1\3x-2的值为零.
x=-1/2时
当a_____时,分式2a-4\a的平方-5a+6 后面是什么!
2(a-2)/(a-2)(a-3)
当a≠2时 可以化简为 2/(a-3) (a≠3)
这题答案是 a≠2 a≠3
(x²+y²-z²+2xy)/(x²-y²+z²-2xz)
=[(x+y)²-z²]/[(x-z)²-y²]
=(x+y-z)(x+y+z)/(x-z-y)(x-z+y)
=(x+y+z)/(x-z-y)
2y\-3x除以6xy
= -2y/3x × 1/6xy
=-1/(9x²)
x的平方-4y的平方\x的平方+4xy+4y的平方除以x的平方+xy-6y的平方\x的平方+5xy+6y的平方
=(x-2y)(x+2y)/(x+2y)² ÷ (x-2y)(x+3y)/(x+2y)(x+3y)
=(x-2y)/(x+2y) × (x+2y)/(x-2y)
=1