巧算:4.2÷[(x-4.6)×0.8-0.3]=42
解方程:2.1÷x=0.3 ,7.2-x=4.3,x-0.84x=0.8,30×(x÷4)=60 ,84+x=10.2
5x-18.5=0 3.6x7-6x=9.6 3.4x-48=26.8 42x+25x=134 0.8x÷ 9=2.7
(0.8x+0.9)÷0.5=(x+5)÷2+(0.3x-0.2)÷0.3
130%x+x=4.6 x÷50%=10 x/9-x/15=16%
x-0.3x-4.6=0.3
4.2-0.8x=2.5x-2.4
0.3x-25=0.8x-60
x-4/1x=8/3 x-0.8x=22 3/2x+2/1x=42
0.3+0.3x=0.39 x= 2x-1.5x=7.6x x= 0.36x÷0.3=1.2 x=
0.3x²+x=0.8 x²+3=2√3x x²+2x-2=0 3x²+4x-7
x+6x=8.4 2.4x+x=27.2 9x-4.2x=24 x-0.6x=4.8 8.6x-4.6x=10.4 7x
(0.3+x)*2=8 7+5x=42 1.3x-x=18.6