Răspuns:
Explicație pas cu pas:
9 × 144 = (10 - 1) × 144
= 10 × 144 - 1 × 144
= 1440 - 144
= 1296
11 × 148 = (10 + 1) × 148
= 10 × 148 + 1 × 148
= 1480 + 148
= 1628
9 × 314 = (10 - 1) × 314
= 10 × 314 - 1 × 314
= 3140 - 314
= 2826
11 × 921 = (10 + 1) × 921
= 10 × 921 + 1 × 921
= 9210 + 921
= 10131
9 × 275 = (10 - 1) × 275
= 10 × 275 - 1 × 275
= 2750 - 275
= 2475
11 × 363 = (10 + 1) × 363
= 10 × 363 + 1 × 363
= 3630 + 363
= 3993
