Выполни действия (N№ 273, 274).
- а) 137 . 220 + 520 . 440 – 8 940
б) 310 . 270 + 145 . 660 - 9 400
а) 300 . (27 + 123) - (З 456 + 1 544) . 4
б) 500 . (35 + 105) - (567 + 1 433) - 5​
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