2[x+x+0.5]=9.8

问题描述:

2[x+x+0.5]=9.8

2[2x+0.5]=9.8
2×2x+0.5×2=9.8
4x+1=9.8
4x=9.8-1
4x=8.8
x=8.8÷4
x=2.22[2x+0.5]=9.82×2x+0.5×2=9.84x+1=9.84x=9.8-1 4x=8.8 x=8.8÷4 x=2.2