题目内容
(2011?富源县模拟)怎样简便就怎样计算.
①4×
+4÷
②5×
×
×
③41×101
④8.5-(5.6+4.8)÷1.3 ⑤12×(
+
-
) ⑥
-(
-
)
①4×
2 |
7 |
7 |
5 |
1 |
3 |
4 |
5 |
3 |
10 |
④8.5-(5.6+4.8)÷1.3 ⑤12×(
1 |
4 |
1 |
6 |
1 |
3 |
11 |
13 |
8 |
9 |
1 |
13 |
分析:(1)(3)(5)运用乘法分配律解答,
(2)运用乘法交换律和结合律解答,
(4)依据四则运算顺序解答,
(6)运用减法性质解答.
(2)运用乘法交换律和结合律解答,
(4)依据四则运算顺序解答,
(6)运用减法性质解答.
解答:解:①4×
+4÷
,
=(
+
)×4,
=1×4,
=4;
②5×
×
×
,
=(5×
)×(
×
),
=4×
,
=
;
③41×101,
=41×100+41×1,
=4100+41,
=4141;
④8.5-(5.6+4.8)÷1.3,
=8.5-10.4÷1.3,
=8.5-8,
=0.5;
⑤12×(
+
-
),
=12×
+12×
-12×
,
=3+2-4,
=1;
⑥
-(
-
),
=
+
-
,
=
-
,
=
.
2 |
7 |
7 |
5 |
=(
2 |
7 |
5 |
7 |
=1×4,
=4;
②5×
1 |
3 |
4 |
5 |
3 |
10 |
=(5×
4 |
5 |
1 |
3 |
3 |
10 |
=4×
1 |
10 |
=
2 |
5 |
③41×101,
=41×100+41×1,
=4100+41,
=4141;
④8.5-(5.6+4.8)÷1.3,
=8.5-10.4÷1.3,
=8.5-8,
=0.5;
⑤12×(
1 |
4 |
1 |
6 |
1 |
3 |
=12×
1 |
4 |
1 |
6 |
1 |
3 |
=3+2-4,
=1;
⑥
11 |
13 |
8 |
9 |
1 |
13 |
=
11 |
13 |
1 |
13 |
8 |
9 |
=
12 |
13 |
8 |
9 |
=
4 |
117 |
点评:(1)正确运用简便方法解决问题,(2)依据四则运算顺序进行计算是本题考查知识点.
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