Вычислить рациональный способом а) 68 * 48 + 68 * 52 б) 59*37+59*63 в) 87*29+87-71 г) 17*73-63*17 д) 382*400-500*382 е) 756 * 360+756*650

а) 68 ⋅ 48 + 68 ⋅ 52 = 68 ⋅ (48 + 52) = 68 ⋅ 100 = 6800.

б) 59 ⋅ 37 + 59 ⋅ 63 = 59 ⋅ (37 + 63) = 59 ⋅ 100 = 5900.

в) 87 ⋅ 29 + 87 ⋅ 71 = 87 ⋅ (29 + 71) = 87 ⋅ 100 = 8700.

г) 17 ⋅ 73 - 63 ⋅ 17 = 17 ⋅ (73 - 63) = 17 ⋅ 10 = 170.

д) 382 ⋅ 400 - 500 ⋅ 382 = 382 ⋅ (400 - 500) = 382 ⋅ ( - 100) = - 382.

е) 756 ⋅ 350 + 756 ⋅ 650 = 756 ⋅ (350 + 650) = 756 ⋅ 1000 = 756000.