Qno1)Simplify a) (9+12)÷7+36÷2of3 b) 12+[7-(4+2)-5-4]
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a) 21/7+36/2X3
=3+18x3
=3+54
=57
b) 12+[7-6-5-4]
= 12+[-8]
=12-8
=4
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