Question

Обчисліть раціонально:
А) 36х28+36х39-67х46
Б) 3,4х3,5-3,4х10,6+6,1х4,4

Answer 1

$36 \times 28 + 36 \times 39 - 67 \times 46 = 36 \times (28 + 39) - 67 \times 46 = 36 \times 67 - 67 \times 46 = 67 \times (36 - 46) = 67 \times ( - 10) = - 670$

$3.4 \times 3.5 - 3.4 \times 10.6 + 6.1 \times 4.4 = 3.4 \times (3.5 - 10.6) + 6.1 \times 4.4 = 3.4 \times ( - 7.1) + 6.1 \times 4.4 = - 24.14 + 26.84 = 2.7$