а) 3712 + 3788 = 37(12+88) = 37100 = 3700в) 3712 - 372 = 37(12-2) = 3710 = 370д) 289 + 229 = 9(28+22) = 950 = 450ж) 189 + 181 = 18(9+1) = 1810 = 180и) 10117 - 17 = 17(101-1) = 17*100 = 1700
а) 3712 + 3788 = 37(12+88) = 37100 = 3700
в) 3712 - 372 = 37(12-2) = 3710 = 370
д) 289 + 229 = 9(28+22) = 950 = 450
ж) 189 + 181 = 18(9+1) = 1810 = 180
и) 10117 - 17 = 17(101-1) = 17*100 = 1700