Вычисли удобным способом

а) (55 + 97) + 3
17 + 24 + 38 + 52 + 6
(183 + 17) + 345
425 + (75 + 143)
б) (129 +74 -29
(863+471) -371
(119+281) - 300
(360 + 225) - 285
в) 538 - (142 + 138
673 - (223 + 130)
811 - (167 + 133)
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