Вычисли, используя один из этих способов: 1) \(430 + 350\) 2) \(520 + 160\) 3) \(460 - 210\) 4) \(810 + 140\) 5) \(690 - 350\) 6) \(970 - 730\)

1) \(430 + 350 = 780\) \(430 + 350 = (400 + 300) + (30 + 50) = 700 + 80 = 780\) 2) \(520 + 160 = 680\) \(520 + 160 = (520 + 100) + 60 = 620 + 60 = 680\) 3) \(460 - 210 = 250\) \(460 - 210 = (460 - 200) - 10 = 260 - 10 = 250\) 4) \(810 + 140 = 950\) \(810 + 140 = (810 + 100) + 40 = 910 + 40 = 950\) 5) \(690 - 350 = 340\) \(690 - 350 = (690 - 300) - 50 = 390 - 50 = 340\) 6) \(970 - 730 = 240\) \(970 - 730 = (970 - 700) - 30 = 270 - 30 = 240\)