求数学题,要详细过程,最好巧算

问题描述:

求数学题,要详细过程,最好巧算
1.30%(x+4)-1=[(0.01x-0.3)/0.02]
2.1/2{7/6[12/7(1/4x-1)-2/7]+4}=x
3.[-2²-(-2*-2*-2)*5]/0.12*(1/6)
4.已知关于x的方程(a/2)x-2=3(a-x)的解满足|2x-1|=0,求a的值
快啊!在线等!

1.30%(x+4)-1=[(0.01x-0.3)/0.02]3(x+4)-10=10*(x-30)/23x+12-10=5x-1503x-5x=-150-12+10-2x=-152x=762.1/2{7/6[12/7(1/4x-1)-2/7]+4}=x1/2[2(1/4x-1)-1/3+4]=x1/4x-1-1/6+2=x3x-12-2+24=12x3x-12x=12+2-24-9x=-1...