Răspuns :
237x346+346x49-346x285 = 346 ·(237+49-285) = 346·1 = 346
99x1457+99x457-99x1914 = 99·(1457+457-1914) = 99·(1914-1914) = 99·0 = 0
346 × ( 237 + 49 - 285 ) = 346 ×( 286 - 285 ) = 346 × 1 = 346
99 × ( 1457 + 457 - 1914 ) = 99 × ( 1914 - 1914 ) = 99 × 0 = 0
99 × ( 1457 + 457 - 1914 ) = 99 × ( 1914 - 1914 ) = 99 × 0 = 0