题目内容
计算.(能简便计算的要用简便法法计算)
700-108÷326
71.32-(5.28÷4+23.9)
÷
-
×7
÷[
×(
-
)].
700-108÷326
71.32-(5.28÷4+23.9)
11 |
26 |
1 |
9 |
11 |
26 |
3 |
10 |
1 |
2 |
7 |
5 |
9 |
10 |
分析:(1)先算除法,再算减法;
(2)先算小括号里面的除法,再算小括号里面的加法,最后算括号外的减法;
(3)先把除法变成乘法,再运用乘法分配律简算;
(4)先算小括号里面的减法,再算中括号里面的乘法,最后算括号外的除法.
(2)先算小括号里面的除法,再算小括号里面的加法,最后算括号外的减法;
(3)先把除法变成乘法,再运用乘法分配律简算;
(4)先算小括号里面的减法,再算中括号里面的乘法,最后算括号外的除法.
解答:解:(1)700-108÷326,
=700-
,
=699
;
(2)71.32-(5.28÷4+23.9),
=71.32-(1.32+23.9),
=71.32-25.22,
=46.1;
(3)
÷
-
×7,
=
×9-
×7,
=
×(9-7),
=
×2,
=
;
(4)
÷[
×(
-
)],
=
÷[
×
],
=
÷
,
=
.
=700-
54 |
163 |
=699
109 |
163 |
(2)71.32-(5.28÷4+23.9),
=71.32-(1.32+23.9),
=71.32-25.22,
=46.1;
(3)
11 |
26 |
1 |
9 |
11 |
26 |
=
11 |
26 |
11 |
26 |
=
11 |
26 |
=
11 |
26 |
=
11 |
13 |
(4)
3 |
10 |
1 |
2 |
7 |
5 |
9 |
10 |
=
3 |
10 |
1 |
2 |
1 |
2 |
=
3 |
10 |
1 |
4 |
=
6 |
5 |
点评:此题主要考查分数、整数、小数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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