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(815÷0.32−79×0.375)÷138

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(
8
15
÷0.32−
7
9
×0.375)÷1
3
8
(815÷0.32−79×0.375)÷138
(1)(
8
15÷0.32-
7
9×0.375)÷1
3
8
=(
8
15÷
8
25-
7

3
8)÷1
3
8
=(
8
15×
25
8-
7

3
8)÷1
3
8
=(
5
3-
7
24)×
8
11
=
33
24×
8
11
=1;
(2)(0.5+0.25+0.125)÷(0.5+0.25+0.125)=1;
(3)139×
137
138+137×1
1
138
=137×
139
138+137×
139
138
=137×
139
138×2
=
19043
69;
(4)1-3+5-7+…-99+101
=1+(5-3)+(9-7)+(13-11)+…+(101-99)
=1+2×25
=51.