就以以下兩條為例:
4x-10>2(呢條答案係3)
4x>2+10
4x>12
x>3
呢條一入個10調個去個陣負要變做正
呢條係咪要咁計?
2-x
— <1(呢條答案係-3)
5
2-x<5
-x<3
x>-3
更新1:
姐係當乘/除負號時,不等式符號就須要相反?
更新2:
thx!!!!