2.4-(-3/5)+(3.1)+4/5=6.9
(-6/13)+(-7/13)-(-2)=1
3/4-(-11/6)+(-7/3)=1/4(2.5)
11+(-22)-3×(-11)=22
(-0.1)÷1/2×(-100)=20
(-3/4)×(-2/3-1/3)*10=15/2(7.5)
(-2)^3-3^2=?
22÷[(-2)^3-(-4)]=?
“^”什么意思?
(3/4-7/8)÷(-7/8)=1/7
(-60)×(3/4+5/6)=-95(负95)
1-2+3-4+5-6+……+99+100=5050