(37-15)×(8+160)=22x168=22x(170-2)=22x170-22x2=3740-44=3696
(37-15)×(8+160)=(20+2)x(170-2)=20x170+2x170-20x20-2x2=3400+340-40-4=3696
(37-15)×(8+160)=22×168=3696