x减20 x等于4.8
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25%x=20x=20×100/25=80x+35%x=540135%x=540x=540×100/135=400x-78%x=8822%x=88x=88×100/22=400
(1-0.3)x=0.7x(1+0.2)x=1.2x
X-20%X=40x-0.2x=400.8x=40x=50
x=3x+20=4x-25先解x=3x+20-20=3x-x-20=2xx=-10再解3x+20=4x-2520+25=4x-3xx=45即方程x=3x+20=4x-25无解.
8再问:求过程
x^4-x²=6x^4-x²-6=0(x²+2)(x²-3)=0(x²+2)(x+√3)(x-√3)=0∵x²+2≥2∴x1=-√3,x2=
20=x-(√3x/3)20=(3-√3)x/3x=60/(3-√3)x=60*(3+√3)/6x=10(3+√3)x=30+10√3
40%:20=x:1520x=15×40%20x=6x=6÷20x=0.3
x-3分之2x=153分之1x=15x=15÷3分之1x=15×3x=45再问:5(x减6.8)等于10.5求x是多少再答:5(x-6.8)=10.55x-5×6.8=10.55x-34=10.55x
再问:eko再答:лл
x-20%x=7分之55分之4x=7分之5x=7分之5÷5分之4x=28分之25
(x-1)(x+2)(x+3)(x+6)+20=0(x-1)(x+6)(x+2)(x+3)+20=0(x^2+5x-6)(x^2+5x+6)+20=0(x^2+5x)^2-36+20=0(x^2+5x
4x-20+x=3004x+x=300+205x=320x=320÷5x=64
9x-x=8x
x-720=x/54x/5=720x=900
x-3/5x=202/5x=20x=50
二分之一x减三分之一x等于八乘以6得3x-2x=48x=48
9.5x减x等于8.5x
x^2-x=20x^2-x-20=0x^2-16-x-4=0(x^2-4^2)-(x+4)=0(x+4)(x-4)-(x+4)=0(x+4)(x-4-1)=0(x+4)(x-5)=0x=-4或x=5