\[Страница\ 24.\]
\[\boxed{\mathbf{1}.}\]
\[\textbf{а)}\ 47 - (15 + 8)\]
\[\textbf{б)}\ (24 + 13) - 21\]
\[\textbf{в)}\ 58 + (66 - 19)\]
\[\textbf{г)}\ (27 - 15) + 90\]
\[\boxed{\mathbf{2}.}\]
\[\textbf{а)}\ a = 56:\]
\[a + 29 = 56 + 29 = 85.\]
\[\textbf{б)}\ a = 66:\]
\[a + 29 = 66 + 29 = 95.\]
\[\boxed{\mathbf{3}.}\]
\[\textbf{а)}\]
\[n\] | \[27\] | \[34\] | \[67\] | \[75\] |
---|---|---|---|---|
\[n + 25\] | \[52\] | \[59\] | \[92\] | \[100\] |
\[n - 19\] | \[8\] | \[15\] | \[48\] | \[56\] |
\[\textbf{б)}\ \]
\[x\] | \[18\] | \[24\] | \[38\] | \[49\] |
---|---|---|---|---|
\[53 + x\] | \[71\] | \[77\] | \[91\] | \[102\] |
\[92 - x\] | \[74\] | \[68\] | \[54\] | \[43\] |
\[\boxed{\mathbf{4}.}\]
\[\textbf{а)}\ a + 250 + b\]
\[\textbf{б)}\ x - 7\]
\[\textbf{в)}\ 10 + (10 + n)\]