题目内容
计算下面各题(能简算的要简算).
807×99+807;
[1-(
-
)]×
;
20.01×83+1.7×200.1;
(1.5+2
)÷3.75-
;
×
+
÷
.
807×99+807;
[1-(
| 1 |
| 2 |
| 1 |
| 4 |
| 2 |
| 5 |
20.01×83+1.7×200.1;
(1.5+2
| 2 |
| 3 |
| 2 |
| 3 |
| 6 |
| 5 |
| 3 |
| 8 |
| 5 |
| 8 |
| 5 |
| 6 |
考点:分数的四则混合运算,运算定律与简便运算,分数的简便计算,整数、分数、小数、百分数四则混合运算
专题:运算顺序及法则
分析:(1)(3)(5)运用乘法分配律解答,
(2)按照先算小括号里面的,再算中括号里面的,最后算括号外面的顺序计算即可解答,
(4)按照先算括号里面的,再算除法,最后算减法顺序计算即可解答.
(2)按照先算小括号里面的,再算中括号里面的,最后算括号外面的顺序计算即可解答,
(4)按照先算括号里面的,再算除法,最后算减法顺序计算即可解答.
解答:
解:(1)807×99+807
=807×(99+1)
=807×100
=807;
(2)[1-(
-
)]×
=[1-
]×
=
×
=
;
(3)20.01×83+1.7×200.1
=20.01×(83+17)
=20.01×100
=2001;
(4)(1.5+2
)÷3.75-
=4
÷3.75-
=1
-
=
;
(5)
×
+
÷
=
×(
+
)
=
×1
=1
.
=807×(99+1)
=807×100
=807;
(2)[1-(
| 1 |
| 2 |
| 1 |
| 4 |
| 2 |
| 5 |
=[1-
| 1 |
| 4 |
| 2 |
| 5 |
=
| 3 |
| 4 |
| 2 |
| 5 |
=
| 3 |
| 10 |
(3)20.01×83+1.7×200.1
=20.01×(83+17)
=20.01×100
=2001;
(4)(1.5+2
| 2 |
| 3 |
| 2 |
| 3 |
=4
| 1 |
| 6 |
| 2 |
| 3 |
=1
| 1 |
| 9 |
| 2 |
| 3 |
=
| 4 |
| 9 |
(5)
| 6 |
| 5 |
| 3 |
| 8 |
| 5 |
| 8 |
| 5 |
| 6 |
=
| 6 |
| 5 |
| 3 |
| 8 |
| 5 |
| 8 |
=
| 6 |
| 5 |
=1
| 1 |
| 5 |
点评:(1)依据四则运算计算方法正确进行计算,(2)运用乘法分配律解决问题,是本题考查知识点.
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