11-x=7 解方程
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/05 04:16:02
3.1x-x=7解方程2.1x=7x=7/2.1=70/21=10/33分之10施主,我看你骨骼清奇,器宇轩昂,且有慧根,乃是万中无一的武林奇才.潜心修习,将来必成大器,鄙人有个小小的考验请点击在下答
x(x-7)-8(x-7)=0(x-8)(x-7)=0x=8或7100好评,
11X-7=2611X=7+2611X=33X=33/11X=3
【解法一】【解法二】5x(x+7)(x+4)=5x(x^2+11X)5x(x²+11x+28)-5x(x²+11x)=05x^3+55x^2+140x=5x^3+55x^25x(x
7x-2x+3x=365x+3x=368x=36x=4.5
1/(x-6)+1/(x-11)=1/(x-7)+1/(x-12)(x-11)(x-7)(x-12)+(x-6)(x-7)(x-12)=(x-6)(x-11)(x-12)+(x-6)(x-11)(x-
-2x=-8x=4再答:谢谢
移项5X-2X+X=7(5-2+1)X=74X=7X=7÷4X=1又4分之3
令2x-11=0,得x=11/2令x-3=0,得x=3令x-8=0,得x=8当x
7x(x+8)+5x=2607x²+56x+5x-260=07x²+61x-260=0判别式=61²+4×7×260=11001x=(-61±√11001)/14再问:用
7x-5x=11+92x=20x=10
0.3x+7x-15%x=21.250.3x+7x-0.15x=21.257.15x=21.25715x=2125143x=425x=425/143
(7-2+3)X=368X=36X=9/2
(1+7)x=168=8x=167x=167÷8x=20.875
x/(2x^2-11x-21)=(x+7)/(x^2-12x+35)x/(2x+3)(x-7)=(x+7)/(x-5)(x-7)约去x-7(显然x=7不是方程的根)x/(2x+3)=(x+7)/(x-
是方程,解是所有数,包括实数虚数
7x_4x二11-2再答:3x二9再答:x二3
x²+3x-9=x-11x²+3x-x-9+11=0x²+2x+2=0Δ=2²-4*1*2=-4
x=11-7x=4
原方程可化为:7x(x+1)+3x(x−1)=1+7−x2(x+1)(x−1)方程两边乘x(x+1)(x-1)得,7(x-1)+3(x+1)=x(x+1)(x-1)+x(7-x2)化简得,4x=4∴x