题目内容
用递等式计算.
①9.52×0.23÷1.7
②
÷6+
×
③
÷[
-(
-
)].
①9.52×0.23÷1.7
②
| 8 |
| 13 |
| 1 |
| 6 |
| 5 |
| 13 |
③
| 9 |
| 32 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
分析:①按运算顺序从左往右依次计算;
②把除法改为乘法,运用乘法分配律简算;
③中括号内运用减法的性质以及加法交换律与结合律简算,最后算括号外的除法.
②把除法改为乘法,运用乘法分配律简算;
③中括号内运用减法的性质以及加法交换律与结合律简算,最后算括号外的除法.
解答:解:①9.52×0.23÷1.7,
=2.1896÷1.7,
=1.288;
②
÷6+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
③
÷[
-(
-
)],
=
÷[
+
-
],
=
÷
,
=
×
,
=
.
=2.1896÷1.7,
=1.288;
②
| 8 |
| 13 |
| 1 |
| 6 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 6 |
| 1 |
| 6 |
| 5 |
| 13 |
=(
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 6 |
=1×
| 1 |
| 6 |
=
| 1 |
| 6 |
③
| 9 |
| 32 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 9 |
| 32 |
| 3 |
| 4 |
| 1 |
| 4 |
| 7 |
| 16 |
=
| 9 |
| 32 |
| 9 |
| 16 |
=
| 9 |
| 32 |
| 16 |
| 9 |
=
| 1 |
| 2 |
点评:此题主要考查分数小数的四则混合运算的运算顺序,以及应用运算定律进行简便计算.
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