( 315 x 4 + 5 x 313 ) : 310
= 315 x ( 4 + 5 ) : 316
= 315 x 9 : 316
= 317 : 316
= 3
(315 x 4 + 5 x 315) : 316
= 315 x (4 + 5) : 316
= 315 x 9 : 316
= 315 x 32 : 316
= 317 : 316
= 31
= 3
(315 x4+5x315):316
= 315x(4+5):316
= 315x9:316
=315x32:316
=317:316
=3