1.-10+10x^2/x^3+2x^2-x-2 约分2.已知y/x=5/3,求3x^2-5xy+2y^2/2x^2+3xy-5y^2的值

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/16 05:49:01
1.-10+10x^2/x^3+2x^2-x-2 约分2.已知y/x=5/3,求3x^2-5xy+2y^2/2x^2+3xy-5y^2的值
xQJ134 Iۀ$""ZQ"ՅR&:+4 C fsϽsQe˲NS@,$$2/B3D}:w0QgT*,Lso:ϟF%WOu%U;=kKu'{SENupjݔq=xEn,sB?­ e9P^T)lª& Xx-^ckG~1irj.jҫIcCn/??zdUi#s7ӓ0K4Aa[@״'TA* R`kJr Pȼt7^/

1.-10+10x^2/x^3+2x^2-x-2 约分2.已知y/x=5/3,求3x^2-5xy+2y^2/2x^2+3xy-5y^2的值
1.-10+10x^2/x^3+2x^2-x-2 约分
2.已知y/x=5/3,求3x^2-5xy+2y^2/2x^2+3xy-5y^2的值

1.-10+10x^2/x^3+2x^2-x-2 约分2.已知y/x=5/3,求3x^2-5xy+2y^2/2x^2+3xy-5y^2的值
-10+10x^2/x^3+2x^2-x-2
=10(x^2-1)/[x^2(x+2)-(x+2)]
=10(x^2-1)/[(x+2)(x^2-1)]
=10/(x+2)
y/x=5/3
所以y/5=x/3
令y/5=x/3=k
y=5k
x=3k
(3x^2-5xy+2y^2)/(2x^2+3xy-5y^2)
=(3x-2y)(x-y)/(2x+5y)(x-y)
=(3x-2y)/(2x+5y)
=(9k-10k)/(6k+25k)
=-k/31k
=-1/31

你唬我啊
哪有初二的题这么难

对1.原式=10(x^2-1)/[(x+2)*(x^2-1)]=10/(x+2)
对2.上下除x*y,原式=[3*(x/y)-5+2*(y/x)]/[2*(x/y)+3-5*(y/x)]=-1/31

已知x=2π+1.求(X-1)+(X-2)+(X-3)+(X-4)+(X-5)+(X-6)+(X-7)+(X-8)+(X-9)+(X-10) (x-1)/(x+3x+2)+6/(2+x-x)-(10-x)/(4-x) X+X+X+(X-1)+(X-2)+(X-3)+(X-4)=10(X-3)+(X-4) (X-2)(X+3)+3x+10 1.x²-2x-3 2.x²-5x-6 3.x²-9x-10 4.x²-9x-10 5.x²-2x-8 6.x²+2x-8 7.x²-x-12 8.x²+x-12 9.x²+6x-16 10.x²-14x-32 11.x²+7x-18 1.【x-1分之x平方+3x+2】+【6分之2+x-x平方】-【10-x分之4-x平方】2.【x+1-1分之1-x】除以【x-x平方分之x-1】3.【x平方-4分之x平方-x-6】+【x+2分之x-3】这个结果再除以【x+1分之x-3】4.【x分之x-y】乘以 x^2+2x/3x^2+x-10化简 3x-{-4x+{5x-(12x-10]+2} 1+x+x^2+x^3+x^4+x^5+x^6+x^7+x^8+x^9+x^10+x^11+x^12=97.8x+x^2+x^3+x^4+x^5+x^6+x^7+x^8+x^9+x^10+x^11+x^12=97.8 好多年没有用过过数学公式了 想不起来怎么算了 想知道 X值是多少 x^2-3|x|-10 已知x=2π+1求 |x-1|+|x-2|+|x-3|+|x-4|+|x-5|+|x-6|+|x-7|+|x-8|+|x-9|+|x-10| 1+x+x^2+x^3+x^4+x^5+x^6+x^7+x^8+x^9+x^10+x^11=17.7这个方程怎么样求解? 1.x/x-y * y^2/x+y -x^4y/x^4-y^4÷ x^2/x^2+y^2 2.(x^2-4/x^2-x-6+ x+2/x-3)÷ x+1/x-33.(x+1-1/1-x)÷(x- x^2/x-1)4.x-1/x^2+3x+2/6/2+x-x^2-10-x/4-x^21111111111111111111111111111111 (x-1)(x-2)(x-3)(x-4)-(x^2-5x)^2-10(x^2-5x)怎么算? 如何计算(x-1)(x-2)(x-3)(x-4)-(x^2-5x)^2-10(x^2-5x) 求余数1.(x平方-2x+3)除以(2x+3)2.(x五次方-1)除以(x-2)3.21x五次+33x四次-70x三次+21x平方+x-1)除以x分解因式2x三次+5x平方2x-94x三次-15x平方+8x+3x四次-5x三次+20x-16x四次-2x平方+3x-2x五次-10x平方+15x-6若有若( 计算(x*x+4x+5)/(x+2)-(x*x+6x+10)/(x+3)+1 X+7/X+1+X+8/X+2-X+9/X+3-X+10/X+4 的解法