题目内容

递等式计算,能简算的要简算.
①254×99
②13.6-(2.6+0.25÷25%)
③1200÷〔56×(
3
7
-
3
8
)〕
④(
6
13
×1.7+
7
13
×1.7)÷
7
10

⑤1375+450÷15×25.
①254×99,
=254×(100-1),
=25400-254,
=25146,

②13.6-(2.6+0.25÷25%),
=13.6-(2.6+1),
=13.6-3.6,
=10;

③1200÷[56×(
3
7
-
3
8
)],
=1200÷[56×
3
7
-56×
3
8
],
=1200÷[24-21],
=1200÷3,
=400;

④(
6
13
×1.7+
7
13
×1.7)÷
7
10

=1.7×(
6
13
+
7
13
)÷
7
10

=1.7×1×
10
7

=
17
7

=2
3
7


⑤1375+450÷15×25,
=1375+30×25,
=1375+750,
=2125.
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