50克×12%+X=(50克+X)×12.5%
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3x=x+1003x-x=1002x=100x=100/2x=50
90/(x-90)=(2x-50)/(x+50)(2x-50)(x-90)=90(x+50)2x^2-230x+4500=90x+45002x^2-230x-90x+4500-4500=02x^2-3
14X-8X=12x=220X-50=50x=528+6X=88x=1024-3X=3x=799X=100-Xx=1X+3=18x=15X-6=12x=1856-2X=20x=184X+2=6x=1X
原式等于(300+50x)/x=300/(x+12)300x=300x+3600+600x+50x^2x^2+12x+72=0因为b^2-4ac=12*12-72*4
(1)2x-10=15x+3013X=-40=>x=-40/13(2)6x-6=6x+20=8=>无解(3)9-3x=2x-85x=17=>x=17/5(4)5x=9x-504x=50=>x=25/2
18x+37=51.418x=14.4x=0.89x-7x=502x=50x=255x+6x=16.9411x=16.94x=1.5412x/4=2412x=24×4x=96÷12x=8
30-3(3-X)=4X30-9+3x=4x21=xx=213X+12*6=15X+1272-12=15x-3x12x=60x=54X-2(50-X)=204x-100+2x=206x=120x=20
5x+4(2x-14)+12×140/50=5(2x-14)+4x5x+8x-56+33.6=8x-70+4x13x-22.4=12x-7013x-12x=22.4-70x=-47.6再问:貌似做错了
两边同时乘400:5x-4800=8x移项:5x-8x=4800合并同类项:-3x=4800两边同时除以-3:x=-1600
1.153.204.205.5007.30008.200对不起啊,第二,六题看不懂
75%*X*10-(X-50)*10=(X-30)*12-(X-50)*127.5X-10X+500=12X-360-12X+600-2.5X+500=240-2.5X=-500+2402.5X=26
x-12.5-0.25x-6+8=18x-0.25x=18-8+6+12.50.75x=28.5x=28.5÷0.75x=38
x-0.5×{x-(0.5x+12)}+8-(0.5x+12)=18x-0.5×(0.5x-12)-0.5x-4=180.5x-(0.25x-6)=220.25x=16x=64你写的时候把0.5换成二
20%x+[25*20%x]+12=50%x+20.2x+5x+12=0.5x+24,7x=-10x=-100/47
x-x/7-(x/12+x/8)-(x/4+x/20+x/5)=500x-x/7-(5/24)x-x/2=500(1/2-5/24)x-x/7=500(7/24)x-x/7=50049x-24x=50
(50+2x)(50-x)=21002500+50x-2x²=2100x²-25x-200=0x=(25±5√57)/2
2(50+5x)=88+12x100+10x=88+12x12x-10x=100-882x=12x=6
x/2*50+100=50x25x+100=50x25x-50x=-100-25x=-100x=4
130%x+x=4.61.3x+x=4.62.3x=4.6x=2x÷50%=10x=10乘2x=20x/9-x/15=16%x(1/9-1/15)=16/100x(5/45-3/45)=4/25x=4