题目内容
计算
(1)
×(
-
)
(2)(1-0.6)÷
(3)
÷( 3-
-
)
(4)
÷[
-(
+
)].
(1)
1 |
4 |
3 |
4 |
1 |
2 |
(2)(1-0.6)÷
1 |
4 |
(3)
1 |
4 |
5 |
13 |
5 |
13 |
(4)
4 |
9 |
5 |
6 |
1 |
6 |
1 |
3 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先算减法,再算乘法;
(2)先算减法,再算除法;
(3)小括号里面的根据减法的性质进行简算,最后算除法;
(4)先算加法,再算减法,最后算除法.
(2)先算减法,再算除法;
(3)小括号里面的根据减法的性质进行简算,最后算除法;
(4)先算加法,再算减法,最后算除法.
解答:
解:(1)
×(
-
)
=
×
=
;
(2)(1-0.6)÷
=0.4÷
=1.6;
(3)
÷(3-
-
)
=
÷[3-(
+
)]
=
÷[3-
]
=
÷2
=
;
(4)
÷[
-(
+
)]
=
÷[
-
]
=
÷
=
.
1 |
4 |
3 |
4 |
1 |
2 |
=
1 |
4 |
1 |
4 |
=
1 |
16 |
(2)(1-0.6)÷
1 |
4 |
=0.4÷
1 |
4 |
=1.6;
(3)
1 |
4 |
5 |
13 |
5 |
13 |
=
1 |
4 |
5 |
13 |
5 |
13 |
=
1 |
4 |
10 |
13 |
=
1 |
4 |
3 |
13 |
=
13 |
116 |
(4)
4 |
9 |
5 |
6 |
1 |
6 |
1 |
3 |
=
4 |
9 |
5 |
6 |
1 |
2 |
=
4 |
9 |
1 |
3 |
=
4 |
3 |
点评: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定律简便计算.
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