earE 1、向东走5米,再向东走3米, 两次一共向东走了多少米? 1234567 (+5)+(+3)=8
1、 向东走5米,再向东走3米, 两次一共向东走了多少米? -1 0 1 2 3 4 5 6 7 8 (+5)+(+3)=8 5 3
earE 2、向西走5米,再向西走3米, 两次一共向东走了多少米? 8-7-6 5-4 3-2 -10 (-5)+(-3)=-8
2、向西走5米,再向西走3米, 两次一共向东走了多少米? -8 -7 -6 -5 -4 -3 -2 -1 0 1 - 3 - 5 (-5)+(-3)=-8