2. [(-15)+(-3)(+5)]÷[(-4)(-3)]
3. [(+3)-(-4)(-5)]÷[(-4)(-3)]
4. [(-2)(+3)-(-2+3)]÷[(+2)(-3)]
5. [(-13)-(+2)]÷[(+2)-(-1)]
6. [(+100)÷(-5)]÷[(-2)+(+1)]
2 2
7. -3x(-4)-(-2)
2 2
8. (-6)+(-1)x(-5)
更新1:
2 2 7. -3x(-4)-(-2)
更新2:
是有8題啊，不是1，2題啊!!!
