解方程:x-4 5x=21
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5.4X+X=12.86.4x=12.8x=2X-0.36X=160.64x=16x=25
21.3=35.1x-x21.3=34.1xx=21.3÷34.1x=213/341(341分之213)(21.3-X)*X=35.121.3X-X²=35.1X²-21.3X+3
4/3x=20x=15
x-0.3x=21提取公因式x得(1-0.3)x=21合并同类项得0.7x=21一次项系数化为一得x=30再问:补充的再答:340立方厘米=(0.34)立方分米2.05立方米=(2050)升6分之1分
8.8x+x=989.8x=98x=10
(1)35x+x=20, 1.6x=20, &n
x=4x=5x=0.7x=100
3x-21+x=2713X+X=271+214X=292X=292÷4X=73
7.5x+4.5x=2012x=20x=5/3
4.5x+x=11/175.5x=11/1711/2x=11/171/2x=1/17x=2/17
6^x+4^x=9^x3^x*2^x+(2^x)^2=(3^x)^2,两边同除以(2^x)^2,(3/2)^x+1=[(3/2)^x]^2,设(3/2)^x=t,t+1=t^2,t^2-t-1=0,t
原式=2.1X-1X=111.1X=11X=11/1.1X=10
X^2+4X=60X^2+4X+2^2=60+2^2(X+2)^2=64X+2=8X=6
24x+x=025x=0-025x=0x=0
X²-3X=0X(X-3)=0X=0或X=3
x=602(x/45)+x/90-x/60=12x/90+x/90-x/60=13x/90-x/60=16x/180-3x/180=1x=60