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72:9x(20-3x5)
80-5x(8-30:5)
6+6:(8-6)+8x6-7


Răspuns :

8×(20-15)=8×5=40
80-5×(8-6)=80-5×2=80-10=70
6+6:2+48-7=6+3+41=9+41=50
 72:9x(20-3x5)=72:9x(20-15)      72:45=1,6
80-5x(8-30:5)=80-10=70
6+6:(8-6)+8x6-7=6+3+48-7=50