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×(
-
)〕
④(
×1.7+
×1.7)÷
⑤1375+450÷15×25.
①254×99
②13.6-(2.6+0.25÷25%)
③1200÷〔56×(
| 3 |
| 7 |
| 3 |
| 8 |
④(
| 6 |
| 13 |
| 7 |
| 13 |
| 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×(
-
)],
=1200÷[56×
-56×
],
=1200÷[24-21],
=1200÷3,
=400;
④(
×1.7+
×1.7)÷
,
=1.7×(
+
)÷
,
=1.7×1×
,
=
,
=2
;
⑤1375+450÷15×25,
=1375+30×25,
=1375+750,
=2125.
=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 |
| 3 |
| 8 |
=1200÷[24-21],
=1200÷3,
=400;
④(
| 6 |
| 13 |
| 7 |
| 13 |
| 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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