1) 16•91 - 16•71 = 16•91−7191 - 7191−71 = 16•20 = 3202) 352 + 35•65 = 352 + 35•60 + 35•5 = 352 + 2100 + 175 = 26273) 17•19 + 17•45 - 64•12 = 17•19+4519 + 4519+45 - 64•12 = 17•64 - 64•12 = 1088 - 768 = 320.
1) 16•91 - 16•71 = 16•91−7191 - 7191−71 = 16•20 = 320
2) 352 + 35•65 = 352 + 35•60 + 35•5 = 352 + 2100 + 175 = 2627
3) 17•19 + 17•45 - 64•12 = 17•19+4519 + 4519+45 - 64•12 = 17•64 - 64•12 = 1088 - 768 = 320.