题目内容

计算:
(1)(
5
7
-
2
3
÷
5
21
×5
(2)
4
5
×7.7+3.3×0.8-80%
(1)(
5
7
-
2
3
÷
5
21
×5

=(
5
7
-
2
3
)×
21
5
×5

=
5
7
×
21
5
×5-
2
3
×
21
5
×5

=15-14,
=1;

(2)
4
5
×7.7+3.3×0.8-80%,
=0.8×7.7+3.3×0.8-80%,
=0.8×(7.7+3.3-1),
=0.8×10,
=8.
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