2x+(99-x)×(1÷2)=99怎样解 有赏
问题描述:
2x+(99-x)×(1÷2)=99怎样解 有赏
答
2x + (99 - x)(1/2) = 99
4x + 99 - x = 99 + 99
4x - x = 99
3x = 99
x = 33