45+28=73, 87-35=52, 0+437=437, 17÷2=8…1,
60÷8=7…4, 48÷6=8,
3
8 +
2
8 =
5
8 ,
5
7 -
1
7 =
4
7 ,
1-
4
5 =
1
5 , 15×2+143=173, 109-36÷4=100, 58×0+128=128.
45+28=73, 87-35=52, 0+437=437, 17÷2=8…1,
60÷8=7…4, 48÷6=8,
3
8 +
2
8 =
5
8 ,
5
7 -
1
7 =
4
7 ,
1-
4
5 =
1
5 , 15×2+143=173, 109-36÷4=100, 58×0+128=128.