3/4除以x等于1/2
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/30 04:28:20
X÷2/3÷4/5=120X÷(2/3×4/5)=120X÷8/15=120X=120×8/15X=64或者X÷2/3÷4/5=120X=120×4/5×2/3X=96×2/3X=64
题是这样的不,x/4+2x/3+x/2=51去分母得:3x+8x+6x=712x=612/17x=36
2X除以7加4分之1X的和除以5X除以7加3X除以4=(2X/7+X/4)/(5X/7+3X/4)=(8X+7X)/(20X+21X)=15/41
x-2除以6-x+2除以3等于1+x-1除以2两边乘6x-2-2(x+2)=6-3(x-1)-x-6=9-3x3x-x=9+62x=15x=7.5
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)=
两边同乘x可得,1/3*0.8=0.4x系数化为1得,x=2/3
x=(1/5+3/2)÷4/5=17/10*5/4=17/8=2又1/8
原方程可化为:x(1/1×2+1/2×3+1/3×4+...+1/2005×2006)=2005这里面需要用到小学奥数的裂项相消:x(1-1/2+1/2-1/3+...-1/2005+1/2005-1
是1/x+1/y=5么?题不对吧
1/(x-1)+1/(x-4)-[1/(x-2)+1/(x-3)]=0通分(2x-5)/(x²-5x+4)-(2x-5)/(x²-5x+6)=0(2x-5)[1/(x²-
你的题是[(x-2)/(x+2)]-1=3/(x^2-4)等式前面通分得:(x-2)/(x+2)-(x+2)/(x+2)=3/(x^2-4)化简:-4/(x+2)=3/(x^2-4)3x+6=-4x^
4/(x-1)-1/(2x-1)-2=4(2x-1)/(x-1)(2x-1)-(x-1)/(x-1)(2x-1)-2(x-1)(2x-1)/(x-1)(2x-1)=(8x-4-x+1-4x²
是(x-1)/(x-2+1)=3吗x-1=3x-3无解
裂项相消.1/(x+a)(x+b)=【1/(x+a)-1/(x+b)】*1/(b-a)一般都是这种形式.特别是你那道题的形式应该让你联想起来这种形式.比如1/(x+1)(x+3)+1/(x+3)(x+
2/3x=12*1/42/3x=3x=3/2/3x=9/2
解题思路:去分母进行求解解题过程:答案见附件最终答案:略
x+x/2+x/3=5511x/6=55x=30
(1-x)/3=2-x1-x=6-3x2x=5x=2.5再问:你在验算一下再答:左边=(1-2.5)÷3=-1.5÷3=-0.5右边=2-2.5=-0.5左=右再问:1-2.5减不够再答:额,负数没学
3x除以4等于2y除以5两边乘以4/3左边=x右边=y*2/5*4/3=y*8/15所以x除以y等于8除以15