1.

\begin{array}{l}{y / 24-20 \div 4-3 \times(-7)} \\ {\text { 3. } 21-12 \div(2 \times 3-4)} \\ {\text { 5. } 16-\{9-24 \div(8+6 \times 2-16)\}} \\ {4-[16-\{6+12 \div(9-6)\}]}\end{array}

Answer»

1)24-20÷5×2=24-4×2=24-8=163)21-12÷4-3×(-7)=21-3+21=395)30-{8÷(2×3-4)}=30-{8÷(6-4)}=30-(8/2)=30-4=267)16-{9-24÷(8+6×2-16)}=16-{9-24÷(8+12-16)}=16-{9-24÷4}=16-(9-6)=16-3=13


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