46+34=80, 72-28=44, 800×5=4000, 5000+200=5200,
32×2=64, 96÷3=32, 80÷4=20, 7700-700=7000,
64÷2=32, 27+45=72, 85-78=7, 1400-600=800,
2
5 +
1
5 =
3
5 ,
4
7 -
1
7 =
3
7 ,
3
8 +
4
8 =
7
8 ,
9
10 -
6
10 =
3
10 .
46+34=80, 72-28=44, 800×5=4000, 5000+200=5200,
32×2=64, 96÷3=32, 80÷4=20, 7700-700=7000,
64÷2=32, 27+45=72, 85-78=7, 1400-600=800,
2
5 +
1
5 =
3
5 ,
4
7 -
1
7 =
3
7 ,
3
8 +
4
8 =
7
8 ,
9
10 -
6
10 =
3
10 .