6. Вычислите a + b, a − b, a·b, a:b, если a = 4,2.108, b = 2,1-102

6. Вычислите a + b, a − b, a·b, a:b, если
a = 4,2⋅10³, b = 2,1⋅10²

a + b = 4,2⋅10³ + 2,1⋅10² = 4200 + 210 = 4410

a − b = 4,2⋅10³ − 2,1⋅10² = 4200 − 210 = 3990

a ⋅ b = 4,2⋅10³ ⋅ 2,1⋅10² = 4,2 ⋅ 2,1 ⋅ 10^(3+2) = 8,82 ⋅ 10^5 = 882000

a : b = (4,2⋅10³) / (2,1⋅10²) = (4,2 / 2,1) ⋅ 10^(3-2) = 2 ⋅ 10 = 20

Ответ: a + b = 4410; a − b = 3990; a ⋅ b = 882000; a : b = 20