(1)3.6-2.8+7.4-7.2
=(3.6+7.4)-(2.8+7.2)
=11-10
=1
(2)
37
100 ×101-
37
100
=
37
100 ×(101-1)
=
37
100 ×100
=37
(3)(5÷
5
6 -
5
6 ÷5)÷
5
18
=(6-
1
6 )×
18
5
=
35
6 ×
18
5
=21
(4)
4
5 ×7.7+3.3×0.8-80%
=0.8×(7.7+3.3-1)
=0.8×10
=8
(1)3.6-2.8+7.4-7.2
=(3.6+7.4)-(2.8+7.2)
=11-10
=1
(2)
37
100 ×101-
37
100
=
37
100 ×(101-1)
=
37
100 ×100
=37
(3)(5÷
5
6 -
5
6 ÷5)÷
5
18
=(6-
1
6 )×
18
5
=
35
6 ×
18
5
=21
(4)
4
5 ×7.7+3.3×0.8-80%
=0.8×(7.7+3.3-1)
=0.8×10
=8