题目内容
简算:
19.34-5.78-3.22
(
+
-
)×36
×
+
×
.
19.34-5.78-3.22
(
3 |
4 |
1 |
6 |
2 |
9 |
5 |
17 |
8 |
9 |
8 |
17 |
4 |
9 |
分析:(1)19.34-5.78-3.22,应用减法的运算性质,a-b-c=a-(b+c),进行简便计算.
(2)(
+
-
)×36,应用乘法分配律进行简便计算.
(3)
×
+
×
,根据分数四则混合运算的运算顺序,按照分数四则运算的计算法则进行简算.
(2)(
3 |
4 |
1 |
6 |
2 |
9 |
(3)
5 |
17 |
8 |
9 |
8 |
17 |
4 |
9 |
解答:解:(1)19.34-5.78-3.22,
=19.34-(5.78+3.22),
=19.34-9,
=10.34;
(2)(
+
-
)×36,
=
×36+
×36-
×36,
=27+6-8,
=25;
(3)
×
+
×
,
=
+
,
=
,
=
.
=19.34-(5.78+3.22),
=19.34-9,
=10.34;
(2)(
3 |
4 |
1 |
6 |
2 |
9 |
=
3 |
4 |
1 |
6 |
2 |
9 |
=27+6-8,
=25;
(3)
5 |
17 |
8 |
9 |
8 |
17 |
4 |
9 |
=
40 |
153 |
32 |
153 |
=
72 |
153 |
=
8 |
17 |
点评:此题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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