Question

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Answer 1

A. 40+ [15+ (12-7)+3]-9

   40+ [15+5+3]-9

    40+23-9= 54

B. {87-[38+(13-5)+4]-12}-3

   {87- [38+8+4]-12}-3

   {87-50-12}-3

   25-3= 22

C.[(90-40)-20]+12

  [50-20]+12

    30+12= 42

D. 28+ {[37-(17-9)+(10-7)+7]}

28+ {[37-8+3+7]}

28+39= 67

E. 98+{37-[(17+(10-7)+7]}

98+{37- [17+3+7]}

98+{37-27}

98+10= 108

F. 76-{[(42+11)- (23-15)]+2}

76-{[53- 8]+2}

76- {45+2}

76- 47= 29

G.  132- {(59-38)+(45-26)-10}

132- {21+19-10}

132- 30= 102