(X-X*20%-18-(X-X*20%-18)*10%=X*1/2-3(过程)
1个回答
(X-X*20%-18)-(X-X*20%-18)*10%=X*1/2-3
则(X*80%-18)*90%=X*1/2-3
72%*X-16.2=X*1/2-3
22%*X=13.2
X=60
相关问题
X+0.12x+(18-x)( 1+10%)=20
解方程 X+20% X =18解方程X+20% X =18
5x+18=43 18—3x=15 x—20%X=5
1X3/1+2X4/1+3X5/1+.+18X20/1=?
化简:1/√x(√x+2)+1/(√x+2)(√x+4)+...+1/(√x+18)(√x+20)
20+10%x=80 2x+30%x=9.2 x-15%x=37.4 15+10%x=18
X-20=[X-18+20]/2-3 不好意思,刚刚弄错题
1/1x3+1/2x4+1/3x5.1/18x20=?简便算法,
3X+6=12 40-4X=20 5+6X=35 18=2X-6 20=38-2X = = = = = = = = =
5x+18=43 18—3x=15 x—20%X=5 4分之3X+6分之1x=22 X乘(1—75%)=3.2 25%+