题目内容
脱式计算(能简算的要简算)
| 14.37-5.63-4.37 | 5÷13+27×
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分析:①14.37-5.63-4.37利用一个数连续减去两个数等于这个数减去这两个数的和,变成14.37-(5.63+4.37)计算简便;
②5÷13+27×
+
,把5÷13+27×
变成
+
,然后计算;
③
×
变成
×
然后利用乘法分配律计算;
⑤根据四则混合运算的顺序,先算小括号里的,再算中括号里的,最后算括号外面的.
②5÷13+27×
| 1 |
| 13 |
| 7 |
| 13 |
| 1 |
| 13 |
| 5 |
| 13 |
| 27 |
| 13 |
③
| 5 |
| 17 |
| 1 |
| 9 |
| 1 |
| 17 |
| 5 |
| 9 |
⑤根据四则混合运算的顺序,先算小括号里的,再算中括号里的,最后算括号外面的.
解答:解:①14.37-5.63-4.37,
=14.37-(5.63+4.37),
=14.37-10,
=4.37;
②5÷13+27×
+
,
=
+
+
,
=3;
③
×
+
×
,
=
×
+
×
,
=
×(
+
),
=
;
④
×[(
-
)÷
],
=
×[
×
],
=
×
,
=
.
=14.37-(5.63+4.37),
=14.37-10,
=4.37;
②5÷13+27×
| 1 |
| 13 |
| 7 |
| 13 |
=
| 5 |
| 13 |
| 27 |
| 13 |
| 7 |
| 13 |
=3;
③
| 1 |
| 17 |
| 4 |
| 9 |
| 5 |
| 17 |
| 1 |
| 9 |
=
| 1 |
| 17 |
| 4 |
| 9 |
| 1 |
| 17 |
| 5 |
| 9 |
=
| 1 |
| 17 |
| 4 |
| 9 |
| 5 |
| 9 |
=
| 1 |
| 17 |
④
| 5 |
| 6 |
| 3 |
| 4 |
| 1 |
| 2 |
| 3 |
| 5 |
=
| 5 |
| 6 |
| 1 |
| 4 |
| 5 |
| 3 |
=
| 5 |
| 6 |
| 5 |
| 12 |
=
| 25 |
| 72 |
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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