Question

ex 1 si 2 !!!!!!!!!!!!!!​

Answer 1

1.

$a) \\ 316 + a = 573 \\ a = 573 - 316 \\ a = 257 \\ \\a + 289 = 602 \\ a = 602 - 289 \\ a = 313 \\ \\ \\ b) \\ 931 - a = 457 \\ a = 931 - 457 \\ a = 474 \\ \\ a - 385 = 299 \\ a = 385 + 299 \\ a = 684$

$c) \\ 403 - a = 177 \\ a = 403 - 177 \\ a = 226 \\ \\ a + 586 = 900 \\ a = 900 - 586 \\ a = 314$

2.

$647 + a = 820 \\ a = 820 - 647 \\ a = 173$