解90 75%=(1 20%)x
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题目错了
3/4X+6一1/4X=120一X乘以4得3x+24-x=480-4x3x-x+4x=480-246x=456x=76
x(16-x)=12016x-x2-120=0一元二次方程
4(X-5)+120×12X=7×31444X=41X=41/1444检验:把X=41/1444带入12X≠0∴X=41/1444是方程的解
120%x-十二分之十一x=6.56/5x-11/12x=6.517/60x=6.5x=6.5×60/17=22.94x+0.4x=70.44.4x=70.4x=70.4/4.4=163x+90%×4
x+4x=x+120x+4x-x=1204x=120x=30(等号最好对齐写)
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
如果我没理解错,而你的题目又是正确,我又没算错的话,那么会有:x+2x+2x*2=1202x*2+3x-120=0根据公式a(x+b/2a)^2=(b^2-4ac)/4a求得x=-987/16一般最好
(120%-1)x=51/5x=5x=5*5x=25
7.5x+4.5x=2012x=20x=5/3
2x²+20x=120x²+10x=60x²+10x+25=60+25(x+5)²=85x+5=±√85x=-5-√85,x=-5+√85
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
11/12x+120%x=6.5(11/12+6/5)x=6.5x=6.5÷127/60x=390/254
50X+40X×(2.5X)=12050X+100X=120150X=120X=120/150X=0.8
14x-16=3x+614x-3x=16+611x=22x=26×(x-45)=3x-1206x-270=3x-1206x-3x=270+1203x=390x=130请采纳谢谢.
X²-3X=0X(X-3)=0X=0或X=3
x+x/5=1206x/5=1206x=600x=100再问:第二步有点糊涂,可以讲清楚吗?再答:把x变成5x/5
120%x-x=751.2x-x=750.2x=75x=375