题目内容
(2010?平阳县)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 |
分析:(1)运用乘法结合律解答,
(2)运用乘法交换律和结合律解答,
(3)运用乘法分配律解答,
(4)依据四则运算计算顺序,先算第二级运算,咋说的异界药师,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的解答.
(2)运用乘法交换律和结合律解答,
(3)运用乘法分配律解答,
(4)依据四则运算计算顺序,先算第二级运算,咋说的异界药师,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的解答.
解答:解: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 |
点评:四则运算计算方法,以及正确运用简便算法进行简便运算是本题考查的知识点.
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