题目内容
脱式计算:
10÷
-
×4
÷(3.5-3.2×
)
÷[1÷(
-
)]
×[1.4÷(
+
)].
10÷
5 |
9 |
1 |
6 |
9 |
10 |
5 |
8 |
4 |
5 |
5 |
8 |
1 |
4 |
9 |
10 |
2 |
5 |
3 |
10 |
分析:(1)先算除法和乘法,最后算减法;
(2)先算小括号里面的乘法,再算小括号里面的减法,最后算括号外面的除;
(3)先算小括号里面的减法,再算中括号里面的除法,最后算括号外面的除;
(4)先算小括号里面的加法,再算中括号里面的除法,最后算括号外面的乘.
(2)先算小括号里面的乘法,再算小括号里面的减法,最后算括号外面的除;
(3)先算小括号里面的减法,再算中括号里面的除法,最后算括号外面的除;
(4)先算小括号里面的加法,再算中括号里面的除法,最后算括号外面的乘.
解答:解:(1)10÷
-
×4,
=18-
,
=17
;
(2)
÷(3.5-3.2×
),
=
÷(3.5-2),
=
÷1.5,
=
;
(3)
÷[1÷(
-
)]
=
÷[1÷
]
=
÷
,
=
;
(4)
×[1.4÷(
+
)],
=
×[1.4÷
)],
=
×2,
=
.
5 |
9 |
1 |
6 |
=18-
2 |
3 |
=17
1 |
3 |
(2)
9 |
10 |
5 |
8 |
=
9 |
10 |
=
9 |
10 |
=
3 |
5 |
(3)
4 |
5 |
5 |
8 |
1 |
4 |
=
4 |
5 |
3 |
8 |
=
4 |
5 |
8 |
3 |
=
3 |
10 |
(4)
9 |
10 |
2 |
5 |
3 |
10 |
=
9 |
10 |
7 |
10 |
=
9 |
10 |
=
9 |
5 |
点评:计算注意运算顺序,抓住数字特点,灵活进行计算.

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