题目内容
计算下面各题(怎样简便怎样算):
18.3-7.4-2.6
1-
÷
+
(4×0.25-
)÷
0.75×16+
×5-75%
18.3-7.4-2.6
1-
8 |
15 |
4 |
5 |
2 |
3 |
(4×0.25-
3 |
5 |
4 |
5 |
0.75×16+
3 |
4 |
考点:小数四则混合运算,运算定律与简便运算,整数、分数、小数、百分数四则混合运算
专题:运算顺序及法则,运算定律及简算
分析:(1)根据减法的性质进行简算;
(2)先算除法,再算减法,最后算加法;
(3)先算乘法,再算减法,最后算除法;
(4)根据乘法分配律进行简算.
(2)先算除法,再算减法,最后算加法;
(3)先算乘法,再算减法,最后算除法;
(4)根据乘法分配律进行简算.
解答:
解:(1)18.3-7.4-2.6
=18.3-(7.4+2.6)
=18.3-10
=8.3;
(2)1-
÷
+
=1-
+
=
+
=1;
(3)(4×0.25-
)÷
=(1-
)÷
=
÷
=
;
(4)0.75×16+
×5-75%
=0.75×16+0.75×5-0.75
=0.75×(16+5-1)
=0.75×20
=15.
=18.3-(7.4+2.6)
=18.3-10
=8.3;
(2)1-
8 |
15 |
4 |
5 |
2 |
3 |
=1-
2 |
3 |
2 |
3 |
=
1 |
3 |
2 |
3 |
=1;
(3)(4×0.25-
3 |
5 |
4 |
5 |
=(1-
3 |
5 |
4 |
5 |
=
2 |
5 |
4 |
5 |
=
1 |
2 |
(4)0.75×16+
3 |
4 |
=0.75×16+0.75×5-0.75
=0.75×(16+5-1)
=0.75×20
=15.
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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