a)-28:[( -12+9)-(9-12:3)+1] =
-28:[-3-(9-4)+1]
-28:[-3-5+1]
-28:[-8+1]
-28:-7=4
b) -45:[-2+12(-10+3)]+12
-45:[10-7]+12
-45:3+12
-45:15=3
c)-[-24:(-15+7)]+5
-[-24:-8]+5
-[3]+5
-3+5=2
d)
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a)-28:[( -12+9)-(9-12:3)+1] =
-28:[-3-(9-4)+1]
-28:[-3-5+1]
-28:[-8+1]
-28:-7=4
b) -45:[-2+12(-10+3)]+12
-45:[10-7]+12
-45:3+12
-45:15=3
c)-[-24:(-15+7)]+5
-[-24:-8]+5
-[3]+5
-3+5=2
d)