3x加百分之60x等于18解方程
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(1)162.5%-x=15/16x=162.5%-15/16x=1625/1000-15/16x=13/8-15/16x=11/16(2)x+70%x=340170%x=340170x=34000x
x²+3x-1=0x²=-3x+1所以x³=x×x²=x(-3x+1)=-3x²+x=-3(-3x+1)+x=10x-3原式=(10x-3)+5(-3
百分之50x加40等于80,50%X=80-4050%X=40X=40÷50%X=80百分之50x减8分之3等于20分之350%X=3/20+3/850%X=21/40X=21/40÷50%X=21/
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
90+60%x=10260%x=102-900.6x=12x=20
x3+y3=(x+y)(x2-xy+y2)=-18x2-xy+y2=6(x+y)2-3xy=6-3xy=6-9=-3xy=1x2+y2=6+xy=6+1=7再平方x4+2x2y2+y4=49x4+y4
X加百分之5.40X乘3等于22646x+0.162x=226461.162x=22646x=22646÷1.162x=19488.8再问:谢谢你了帮了我个大忙
m=x²+2xn=3x+2m-n=x²+2x-3x-2=x²-x-2=0(x+1)(x-2)=0x=-1,x=2所以无法比较,选D
35x%+25x%=12.4860x%=12.4860x=1248x=20.8
(x+1)34%+0.1x=(x-1)60%0.34(x+1)+0.1x=0.6(x-1)0.34x+0.34+0.1x=0.6x-0.60.34x+0.1x-0.6x=-0.6-0.34-0.16x
1.20/50=40%2.2x+40%x=7.2(2+0.4)x=7.2x=33.30*2/3+80%x=6020+0.8x=600.8x=40x=504.错
是√(3x^2+x^2)吧,那就是√(4x^2=±2x.
35+35%x=700.35x=70-350.35x=35x=35÷0.35x=100
这个用换元法令a=x/(x²+2)则(x²+2)/x=1/aa+1/a=-10/33a²+10a+3=0(3a+1)(a+3)=0a=-1/3,a=-3x/(x²
18+120%x=24120%x=6x=6/120%x=5
32+0.75x=560.75x=24x=32再问:32减百分之75X等于8再答:32-0.75x=80.75x=24x=32
百分之21乘x加百分之42等于百分之18乘x减3两边同乘以100得:21x+42=18(x-3)3x=-96x=-32再问:为什么(x-3)有括号?再答:百分之21乘x加百分之42等于百分之18乘x减