7x-4x=21方程式
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X-1/4X-(1/4X-4)=50x-1/4x-1/4x+4=501/2x=50-41/2x=46x=92
(x-2)(x+1)(x+4)(x+7)=19(x+2.5-4.5)(x+2.5-1.5)(x+2.5+1.5)(x+2.5+4.5)=19[(x+2.5)^2-4.5^2][(x+2.5)^2-1.
5x-4x=2*1.8x=3.6再问:过程再答:5x-4x=2*1.8(5-4)x=3.6x=3.6
6x-8=1006x=108x=108/6x=18
x^2-7x=-9x^2-2*x*(7/2)+(7/2)^2=-9+(7/2)^2(x-7/2)^2=13/4=(±√13/2)^2x-7/2=±√13/2x=7/2±√13/2所以x1=(7+√13
3x-2x(x-1)=4*1.5-7x3x-2x^2+2x=6-7x2x^2-12x+6=0(x-3)^2=6x=3±√6再问:看不懂啊
(1+0.4)x=211.4x=21x=21÷1.4x=15
方程两边同时减4x得5x-4x+30=4x-4x-10解得x+30=-10方程两边同时减30得x+30-30=-10-30解得x=-40
7x+10x=102解(10+7)x=102x=102/17x=6
把括号拆了5x=5x=1
3X+2=5X+45X-3X=2-42X=-2X=-1
(1+4)X等于205X等于20X等于20除以5X等于4再答:你初一吧!
27x-4x=34.523x=34.5x=34.5÷23x=1.5
卡尔丹公式法(卡尔达诺公式法)特殊型一元三次方程X^3+pX+q=0(p、q∈R)判别式Δ=(q/2)^2+(p/3)^3【卡尔丹公式】X1=(Y1)^(1/3)+(Y2)^(1/3);X2=(Y1)
X-5/7X=162/7x=16x=56
[(x+1)(x+4)][(x+2)(x+3)]-120=0[(x²+5x)+4][(x²+5x)+6]-120=0(x²+5x)²+10(x²+5x
6x-4x=13.2(6-4)x=13.22x=13.2x=13.2÷2x=6.6
0.7x+0.3x=8.8(0.7+0.3)x=8.8x=8.8
2.1+4x=12.54x=12.5-2.14x=10.4x=2.6