解几道初二分试题1.a-b+(2b²)/(a+b)2.(x-2)/x²÷(1-x/2)3.(4+x)
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/10/03 00:23:25
解几道初二分试题
1.a-b+(2b²)/(a+b)
2.(x-2)/x²÷(1-x/2)
3.(4+x)/(x-1)-5=(3+2x)/(x-1)
1.a-b+(2b²)/(a+b)
2.(x-2)/x²÷(1-x/2)
3.(4+x)/(x-1)-5=(3+2x)/(x-1)
1.a-b+(2b²)/(a+b)
=[(a-b)(a+b)+2b^2]/(a+b)
=(a^2+b^2)/(a+b)
2.(x-2)/x²÷(1-x/2)
=(x-2)/x^2÷(2-x)/2
=(x-2)/x^2*2/(2-x)
=-2/x^2
3.(4+x)/(x-1)-5=(3+2x)/(x-1)
(4+x-3-2x)/(x-1)=5
(1-x)/(x-1)=5 /感觉有问题
=[(a-b)(a+b)+2b^2]/(a+b)
=(a^2+b^2)/(a+b)
2.(x-2)/x²÷(1-x/2)
=(x-2)/x^2÷(2-x)/2
=(x-2)/x^2*2/(2-x)
=-2/x^2
3.(4+x)/(x-1)-5=(3+2x)/(x-1)
(4+x-3-2x)/(x-1)=5
(1-x)/(x-1)=5 /感觉有问题
解几道初二分试题1.a-b+(2b²)/(a+b)2.(x-2)/x²÷(1-x/2)3.(4+x)
1.若a²+4b²-2a+4b+2=0,求a、b的值 2.已知x、y满足x²+y²
1.-9a²+4b² 2.(2a-b+c)²-(3a+2b)² 3. 4x&su
1.(b²+2a²)(2a²-b²) 2.(4x²-4y²)
设集合A={x|x²+4x=0},B={x|x²+2(a+1)x+a²-1=0},若B包含
x⁴-a²x²-b²x²+a²b²
分解因式:9x²-16(a+b)² 1/2x⁴y²-1/8x²y
12x²+4x-1 x²-(a+b)xy+aby² xy-1+x-y x²-(2
分式计算,(1)a²-4b²\3ab² × ab\a-2b (2)x²-x\x-
已知函数f(x)=ax²-2根号4+2b-b²x,g(x)=-根号1-(x-a)²,(a.
3x³+2x-5,4x²-4x-1,a³-3a²b+3ab²-b&su
例如:a²+b²-c²-4d²-2ab+4cd x²+2xy+y&su