题目内容
(2011?富源县模拟)计算.
7.73-2.3÷0.5×80% | 1.37+
|
| ||||||||||||
(
|
55×66÷(11×11) | 35÷[
|
分析:(1)先算除法,再算乘法,最后算减法;
(2)运用加法的交换律、结合律进行简算;
(3)运用乘法的分配律进行简算;
(4)运用乘法的分配律进行简算;
(5)先算小括号里的乘法,再从左向右进行计算即可;
(6)先算小括号里的减法,再算中括号里的乘法,最后算括号外的除法.
(2)运用加法的交换律、结合律进行简算;
(3)运用乘法的分配律进行简算;
(4)运用乘法的分配律进行简算;
(5)先算小括号里的乘法,再从左向右进行计算即可;
(6)先算小括号里的减法,再算中括号里的乘法,最后算括号外的除法.
解答:解:(1)7.73-2.3÷0.5×80%,
=7.73-4.6×80%,
=7.73-3.68,
=4.05;
(2)1.37+
+1.63+
,
=(1.37+1.63)+(
+
),
=3+1,
=4;
(3)
×
+
÷
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)(
+
)×24,
=
×24+
×24,
=8+9,
=17;
(5)55×66÷(11×11),
=55×66÷121,
=3630÷121,
=30;
(6)35÷[
×(1-
)],
=35÷[
×
],
=35÷
,
=56.
=7.73-4.6×80%,
=7.73-3.68,
=4.05;
(2)1.37+
9 |
11 |
2 |
11 |
=(1.37+1.63)+(
9 |
11 |
2 |
11 |
=3+1,
=4;
(3)
3 |
8 |
5 |
17 |
5 |
8 |
17 |
5 |
=
3 |
8 |
5 |
17 |
5 |
8 |
5 |
17 |
=(
3 |
8 |
5 |
8 |
5 |
17 |
=1×
5 |
17 |
=
5 |
17 |
(4)(
1 |
3 |
3 |
8 |
=
1 |
3 |
3 |
8 |
=8+9,
=17;
(5)55×66÷(11×11),
=55×66÷121,
=3630÷121,
=30;
(6)35÷[
7 |
8 |
2 |
7 |
=35÷[
7 |
8 |
5 |
7 |
=35÷
5 |
8 |
=56.
点评:此题考查了整数、分数、小数四则混合运算的顺序,注意灵活运用运算定律进行简算.
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