`a)145×16+145×83+123×22`
`=145xx(16+83)+123xx22`
`=145xx99+123xx22`
`=145xx9xx11+123xx2xx11`
`=1305xx11+246xx11`
`=(1305+246)xx11`
`=1551xx11`
`=`\(17061\)
`145 xx 16 + 145 xx 83 + 123 xx 22`
`=145 xx (16 +83) + 123xx 22`
`=145 xx 99+123xx22`
`=145 xx 9 xx 11+123 xx 21 xx 1`
` = (1305+246) xx 11`
`=1551 xx 11 =17061`
\(=145\cdot\left(16+83\right)+123\cdot22=145\cdot99+123\cdot22=17061\)