题目内容
用你喜欢的方法算.
-
+
-
×
+
÷8
÷[(
+
)×
]
5.4×3.6+64×0.54.
5 |
9 |
3 |
16 |
4 |
9 |
2 |
16 |
1 |
8 |
7 |
11 |
4 |
11 |
8 |
9 |
2 |
5 |
1 |
10 |
4 |
3 |
5.4×3.6+64×0.54.
分析:(1)运用加法交换律和结合律以及减法的性质简算;
(2)把除法改为乘法,运用乘法分配律简算;
(3)先算小括号内的,再算中括号内的,最后算括号外的;
(4)格局是字特点,把原式变为0.54×36+64×0.54,运用乘法分配律简算.
(2)把除法改为乘法,运用乘法分配律简算;
(3)先算小括号内的,再算中括号内的,最后算括号外的;
(4)格局是字特点,把原式变为0.54×36+64×0.54,运用乘法分配律简算.
解答:解:(1)
-
+
-
,
=(
+
)-(
+
),
=1-
,
=
;
(2)
×
+
÷8,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(3)
÷[(
+
)×
],
=
÷[
×
],
=
÷
,
=
×
,
=
;
(4)5.4×3.6+64×0.54,
=0.54×36+64×0.54,
=(36+64)×0.54,
=100×0.54,
=54.
5 |
9 |
3 |
16 |
4 |
9 |
2 |
16 |
=(
5 |
9 |
4 |
9 |
2 |
16 |
3 |
16 |
=1-
5 |
16 |
=
11 |
16 |
(2)
1 |
8 |
7 |
11 |
4 |
11 |
=
1 |
8 |
7 |
11 |
4 |
11 |
1 |
8 |
=(
7 |
11 |
4 |
11 |
1 |
8 |
=1×
1 |
8 |
=
1 |
8 |
(3)
8 |
9 |
2 |
5 |
1 |
10 |
4 |
3 |
=
8 |
9 |
1 |
2 |
4 |
3 |
=
8 |
9 |
2 |
3 |
=
8 |
9 |
3 |
2 |
=
4 |
3 |
(4)5.4×3.6+64×0.54,
=0.54×36+64×0.54,
=(36+64)×0.54,
=100×0.54,
=54.
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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