题目内容
脱式计算,能简算的要简算.
+1÷(
-
)
(
+
-
)×24
+(
-
)×
0.625×9.6+62.5%×
.
| 3 |
| 5 |
| 5 |
| 6 |
| 5 |
| 8 |
(
| 5 |
| 6 |
| 2 |
| 3 |
| 3 |
| 4 |
| 2 |
| 3 |
| 4 |
| 5 |
| 1 |
| 6 |
| 8 |
| 18 |
0.625×9.6+62.5%×
| 2 |
| 5 |
分析:(1)按运算顺序计算,先算括号内的减法,再算括号外的除法,最后算加法;
(2)运用乘法分配律简算;
(3)按运算顺序计算,先算括号内的减法,再算括号外的乘法,最后算加法;
(4)把分数、百分数化为小数,然后运用乘法分配律的逆运算简算.
(2)运用乘法分配律简算;
(3)按运算顺序计算,先算括号内的减法,再算括号外的乘法,最后算加法;
(4)把分数、百分数化为小数,然后运用乘法分配律的逆运算简算.
解答:解:(1)
+1÷(
-
),
=
+1÷(
-
),
=
+1÷
,
=
+1×
,
=
;
(2)(
+
-
)×24,
=
×24+
×24-
×24,
=20+16-18,
=18;
(3)
+(
-
)×
,
=
+(
-
)×
,
=
+
×
,
=
+
,
=
+
,
=
;
(4)0.625×9.6+62.5%×
,
=0.625×9.6+0.625×0.4,
=(9.6+0.4)×0.625,
=10×0.625,
=6.25.
| 3 |
| 5 |
| 5 |
| 6 |
| 5 |
| 8 |
=
| 3 |
| 5 |
| 20 |
| 24 |
| 15 |
| 24 |
=
| 3 |
| 5 |
| 5 |
| 24 |
=
| 3 |
| 5 |
| 24 |
| 5 |
=
| 27 |
| 5 |
(2)(
| 5 |
| 6 |
| 2 |
| 3 |
| 3 |
| 4 |
=
| 5 |
| 6 |
| 2 |
| 3 |
| 3 |
| 4 |
=20+16-18,
=18;
(3)
| 2 |
| 3 |
| 4 |
| 5 |
| 1 |
| 6 |
| 8 |
| 18 |
=
| 2 |
| 3 |
| 24 |
| 30 |
| 5 |
| 30 |
| 4 |
| 9 |
=
| 2 |
| 3 |
| 19 |
| 30 |
| 4 |
| 9 |
=
| 2 |
| 3 |
| 38 |
| 135 |
=
| 90 |
| 135 |
| 38 |
| 135 |
=
| 128 |
| 135 |
(4)0.625×9.6+62.5%×
| 2 |
| 5 |
=0.625×9.6+0.625×0.4,
=(9.6+0.4)×0.625,
=10×0.625,
=6.25.
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
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