Explicație pas cu pas:
a) (3+20)-(2+18)=23-20=3
b) (+5-3)×3=+2×3=6
c) - 2×[3-36:(-9)]-2(5+7)=-2×(3+4)-2×12=-2×7-24=-14-24=-38
d)[5^2×(-5)^4×(-5)^3]^5:(-5)^43=[5^2×5^4×(-5)^3]^5:(-5)^43=(-5^9)^5:(-5)^43=(-5)^45×(-5)^43=5^2=25
e)[-3^27:3^26-10]:13+1=(-3-10):13+1==-13:13+1=-1+1=0
