[x减1]乘[x加2]分之2x减3-搜答案-拍题作业网

X等于18的哈

1乘3分之2x加3乘5分之2x加5乘7分之2x加……加2003乘2005分之2x等于20042x/(1*3)+2x/3(*5)+2x/(5*7)+……+2x/(2003*2005)=2004x(1-1

∣x+3∣=-(2x+y)^2,∵∣x+3∣》0,且-(2x+y)^2《0,∴∣x+3∣=(2x+y)^2=0,∴x=-3,y=6∴(3/4)(x^2-3y)+(1/4)(x^2+y)=(3/4)·(

(x+1)(x+2)/(x²+4x+4)×(3x+6)/(2x²-8)×6÷1/(x²-4)=(x+1)(x+2)/(x+2)²×2(x+2)/2(x+2)(x

1.25*8-2x/5+x/6=6.52x/5-x/6=10-6.57x/30=3.5x=3.5*30/7x=15

x(1-1/3)+x(1/3-1/5)+x(1/5-1/7)+……+x(1/2003-1/2005)=2004x(1-1/3+1/3-1/5+1/5-1/7+……+1/2003-1/2005)=200

原式=(x^2-1)/(x^2+2x)*(x-1)/x=(x-1)^2(x+1)/x^2(x+2),解不等式组：x+2>1,——》x>-1,2(x-1)>-6,——》x>-2,所以,解集为：x>-1,

(x减2)乘(x加5)分之4x加1等于x加五分之a加x减2分之b(4x+1)/(x-2)(x+5)=a/(x+5)+b/(x-2)(4x+1)/(x-2)(x+5)=(ax-2a+bx+5b)/(x-

后半句意思都没表达清楚求采纳

3/4（x+8）+6=（2-3/4）x3/4x+6+6=2x-3/4x3/4x-2x+3/4x=-12-1/2x=-12x=24再问：再问：为毛别人解出来的X等于12再答：那个方程正确解应该是x=24

原式=[(x+2y)/(x+y)]×[xy/(x+2y)]÷[(x+y)/xy]=[(x+2y)/(x+y)]×[xy/(x+2y)]×[xy/(x+y)]=x²y²(x+2y)/

二分之一倍的x减2的完全平方

原式=[(x+1)/(x-1)]-[(x²-2x)/(x²-1)]×[(x²+2x+1)/(x²-x-2)]=[(x+1)/(x-1)]-{x(x-2)/[(x

[(x^2-2x+1)/x^2]÷(x^2-1)*[(x^2+x)/(x^2-3x+2)]=[(x-1)^2/x^2]÷[(x+1)(x-1)]*[x(x+1)/(x-1)(x-2)]=(x-1)^2

=[(x+2)/x(x-2)-(x-1)/(x-2)²]×x/(4-x)=[(x²-4-x²+4)/x(x-2)²]×x/(4-x)=1/(x-2)²

60分之X+2乘60分之X加15等于1两边都×60x+2×（x+15）=60x+2x+30=603x=60-303x=30x=30÷3x=10再问：还有没有别的解法再答：基本就是这个解法再问：如果在考

提出X=X(1-1/2+1/2-1/3+...+1/2005-1/2006)=X*2005/2006

(1×2)分之x+(2×3)分之x+……+(2013×2014)分之x=2013[(1×2)分之1+(2×3)分之1+……+(2013×2014)分之1]x=2013(1-2分之1+2分之1-3分之1

3-1/2X+2/75=1/6X+1/62/3X=3/121X=2/121

（x-2分之x减x+2分之x）=(x-2)(x+2)分之x(x+2)-x(x-2)乘4x分之2-x=(x-2)(x+2)分之4x乘4x分之2-x=-x-2