`A = 273 xx 2018 - 273 xx 1000 - 18 xx 273`

`A = 273 xx ( 2018 - 1000 - 18 )`

`A = 273 xx 1000`

`A = 273000`

`B = 6024 xx 324 + 354 xx 3012`

`B = 1951776 + 1066248`

`B = 3018024`

`C = 84 xx 15 - 28 xx 45 + 1000`

`C = 84 xx 15 - 84 xx 15 + 1000`

`C = 84 xx ( 15 - 15 ) + 1000`

`C = 84 xx 0 + 1000`

`C = 0 + 1000`

`C = 1000`

$\color{#00FF00}{\text{p}}\color{#11FF00}{\text{h}}\color{#22FF00}{\text{o}}\color{#33FF00}{\text{n}}\color{#44FF00}{\text{g}}\color{#55FF00}{\text{M}}\color{#66FF00}{\text{1}}\color{#77FF00}{\text{0}}$