1. Calculează.
9.
10
a) 173 + 326
b) 549 - 235
6
235 + 342
667 – 426
514 + 185
893 - 781
642 + 356
951 - 340
c) 157 + 328
d) 673 - 148
329 + 647 598 - 329
483 + 392
812 - 521
578 + 281
937 - 286​

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