420. Вычислите удобным способом: 1) 2 × 328 × 5; 2) 125 × 43 × 8; 3) 25 × 243 × 4; 4) 4 × 36 × 5; 5) 50 × 236 × 2; 6) 250 × 3 × 4.

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Accepted Answer

2 × 328 × 5 = (2 × 5) × 328 = 10 × 328 = 3280
125 × 43 × 8 = (125 × 8) × 43 = 1000 × 43 = 43000
25 × 243 × 4 = (25 × 4) × 243 = 100 × 243 = 24300
4 × 36 × 5 = (4 × 5) × 36 = 20 × 36 = 720
50 × 236 × 2 = (50 × 2) × 236 = 100 × 236 = 23600
250 × 3 × 4 = (250 × 4) × 3 = 1000 × 3 = 3000