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4. a.12÷2+12÷4=6+3=9
b.(42+24)÷6=66÷6=11
5. (36-12):24=24:24=1
Explicație pas cu pas:
4. a) 12:2=6
12:4=3
6+3=9
b)42+24=66
66:6=11
5.36-12=24
24:24=1