4加x括号除以2等于多少
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x/2+40/x=9,x=8或x=10
X/2+40/X=9X²/2X+80/2X=9X²+80=18XX²-18X+80=0X=[18±√﹙18²+4×80﹚]/2X1=﹙18+2﹚/2=10X2=
题是这样的不,x/4+2x/3+x/2=51去分母得:3x+8x+6x=712x=612/17x=36
原式=X/(1*2)+X/(2*3)+X/(3*4)+……+X/(2008*2009)(提取公因式X)=X(1/(1*2)+1/(2*3)+1/(3*4)……+1/(2008*2009)(裂项相消)=
-1/60/(1/3+1/4-1/5)=-1/[60*(1/3+1/4-1/5)]=-1/(20+15-12)=-1/23-1/60/(1/3+1/4-1/5)=(-1/60)/[(20+15-12)
10
1÷(x+2÷3)=4÷51=(4÷5)×(x+2÷3)1=五分之四x+8÷151-8÷15=五分之四x7÷15=五分之四x五分之四x=7÷15x=(7÷15)×(5÷4)x=十二分之七约分:意义:把
520再答:求采,谢谢!
6/3(1+2)=2*(1+2)=6
两种答案6/2(1+2)=6/6=16/2(1+2)=3*3=9
X+(X+2)+X/4=742X+X/4=728X+x=2889X=288X=32
6/2(2+1)=6/6=1
XY互为相反数,x+y=0x-y=2x(x+y+3)(x-y-2)=3(2x-2)=62x-2=2x=2
1000÷(x+2)=50x+2=1000÷50x+2=20x=18
1/x+x=5,求x^2/(x^4+x^2+1)=?由1/x+x=5得1+x^2=5x,===》x^2=5x-1,代人x^2/(x^4+x^2+1)=(5x-1)/【(5x-1)/(5x-1)^2+(
6+36/[(3-2)*4-1]
6+36/[(3-2)*(4-1)]=18
6x