\[\boxed{\mathbf{87\ (87)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ 1275 + \mathbf{3} = 1278\]
\[2)\ 3333 + \mathbf{6} = 3339\]
\[3)\ 25\ 718 + \mathbf{4} = 25\ 722\]
\[4)\ 987\ 652 + \mathbf{8} = 987\ 660\]
\[5)\ 10\ 203\ 040 + \mathbf{8} = 10\ 203\ 048\]
\[6)\ 19\ 191\ 919\ 191 + \mathbf{3} =\]
\[= 19\ 191\ 919\ 194\]
\[\boxed{\mathbf{87}.}\]
\[1)\ b \cdot 72 + c\]
\[b = 4;\ \ c = 112:\]
\[4 \cdot 72 + 112 = 288 + 112 =\]
\[= 400.\]
\[2)\ 2a^{3} - 586\]
\[a = 10:\]
\[2 \cdot 10^{3} - 586 = 2000 - 586 =\]
\[= 1414.\]