题目内容
计算题:
(1)37.5%×637+
×363;
(2)1.314×998;
(3)9.5-[(2.5-
)÷1
]×
;
(4)
×
×
×
×
.
(1)37.5%×637+
3 |
8 |
(2)1.314×998;
(3)9.5-[(2.5-
1 |
4 |
2 |
7 |
3 |
14 |
(4)
1 |
4 |
1 |
15 |
1 |
35 |
1 |
63 |
1 |
99 |
考点:整数、分数、小数、百分数四则混合运算
专题:运算顺序及法则
分析:(1)根据乘法分配律进行简算;
(2)根据乘法分配律进行简算;
(3)先算小括号里面的减法,再算除法,再算乘法,最后算括号外面的减法;
(4)按照从左向右的顺序进行计算.
(2)根据乘法分配律进行简算;
(3)先算小括号里面的减法,再算除法,再算乘法,最后算括号外面的减法;
(4)按照从左向右的顺序进行计算.
解答:
解:(1)37.5%×637+
×363=0.375×637+0.375×363
=0.375×(637+363)
=0.375×1000
=375;
(2)1.314×998
=1.314×(1000-2)
=1.314×1000-1.314×2
=1314-2.628
=1311.372;
(3)9.5-[(2.5-
)÷1
]×
=9.5-[2
÷1
]×
=9.5-
×
=9.5-
=9.125;
(4)
×
×
×
×
=
×
×
×
=
×
×
=
×
=
.
3 |
8 |
=0.375×(637+363)
=0.375×1000
=375;
(2)1.314×998
=1.314×(1000-2)
=1.314×1000-1.314×2
=1314-2.628
=1311.372;
(3)9.5-[(2.5-
1 |
4 |
2 |
7 |
3 |
14 |
=9.5-[2
1 |
4 |
2 |
7 |
3 |
14 |
=9.5-
7 |
4 |
3 |
14 |
=9.5-
3 |
8 |
=9.125;
(4)
1 |
4 |
1 |
15 |
1 |
35 |
1 |
63 |
1 |
99 |
=
1 |
60 |
1 |
35 |
1 |
63 |
1 |
99 |
=
1 |
2100 |
1 |
63 |
1 |
99 |
=
1 |
132300 |
1 |
99 |
=
1 |
13097700 |
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.
练习册系列答案
相关题目
分别从正面、侧面和上面观察下面的4个物体,都能看到物体有几个?( )
A、没有 | B、2个 | C、3个 | D、4个 |
435÷5商是( )位数.
A、4 | B、3 | C、2 |