Răspuns:
-(20+16):(63-59)= -36:4= - 9
-81:(3x3)x(54:9)= - 81:9x6= - 9x6= -54
5x9-7x6=45-42=3
72:8x(48:8)=72:8x6=9x6=54
2-(54-7x6):(30:10+21:7)x(35-7x5)=2-(54-42):(3+3)x(35-35)=2-12:9x0=2
(38-7x4)x(72:9+2)=(38-28)x(8+2)=10x10=100
177-64:(4:4)-64:(4:4)=177-64-64=49
45:(3x3)x7-34=45:9x7-34=5x7-34=35-34=1
Explicație pas cu pas: