1) (374 + 712) + 626 = (374 + 626) + 712 = 1000 + 712 = 1712;
2) 999 + (901 + 2200) = (999+901) + 2200 = 1900 + 2200 = 4100;
3) (3355 + 7777) + 2223 = 3355 + (7777 + 2223) = 3355 + 10000 = 13355
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1) (374 + 712) + 626 = (374 + 626) + 712 = 1000 + 712 = 1712;
2) 999 + (901 + 2200) = (999+901) + 2200 = 1900 + 2200 = 4100;
3) (3355 + 7777) + 2223 = 3355 + (7777 + 2223) = 3355 + 10000 = 13355