题目内容
怎样计算简便就怎样计算.
①1598-490÷18×36
②3.2×8×1.25×
③9.6÷1.25+5.4×
④
+
×(
-0.625)
①1598-490÷18×36
②3.2×8×1.25×
| 3 |
| 16 |
③9.6÷1.25+5.4×
| 4 |
| 5 |
④
| 1 |
| 3 |
| 8 |
| 15 |
| 5 |
| 6 |
①1598-490÷18×36,
=1598-490×(36÷18),
=1598-490×2,
=1598-980,
=618;
②3.2×8×1.25×
,
=(3.2×1.25)×(8×
),
=4×
,
=6;
③9.6÷1.25+5.4×
,
=(9.6+5.4)×
,
=15×
,
=12;
④
+
×(
-0.625),
=
+
×
,
=
+
,
=
.
=1598-490×(36÷18),
=1598-490×2,
=1598-980,
=618;
②3.2×8×1.25×
| 3 |
| 16 |
=(3.2×1.25)×(8×
| 3 |
| 16 |
=4×
| 3 |
| 2 |
=6;
③9.6÷1.25+5.4×
| 4 |
| 5 |
=(9.6+5.4)×
| 4 |
| 5 |
=15×
| 4 |
| 5 |
=12;
④
| 1 |
| 3 |
| 8 |
| 15 |
| 5 |
| 6 |
=
| 1 |
| 3 |
| 8 |
| 15 |
| 15 |
| 24 |
=
| 1 |
| 3 |
| 1 |
| 3 |
=
| 2 |
| 3 |
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