题目内容
(2010?文成县)选择你喜欢的方法计算
(1)4500+500÷25
(2)907×101-907
(2)0.5×[12.2÷(3.7+2.4]
(4)(
+
)×40+
.
(1)4500+500÷25
(2)907×101-907
(2)0.5×[12.2÷(3.7+2.4]
(4)(
3 |
8 |
1 |
5 |
7 |
15 |
分析:(1)先计算除法,再计算加法即可;
(2)根据乘法分配律进行简算即可;
(3)先计算小括号里面的加法,再计算除法,最后计算乘法;
(4)先根据乘法分配律进行计算,然后再计算加法即可.
(2)根据乘法分配律进行简算即可;
(3)先计算小括号里面的加法,再计算除法,最后计算乘法;
(4)先根据乘法分配律进行计算,然后再计算加法即可.
解答:解:(1)4500+500÷25,
=4500+20,
=4520;
(2)907×101-907,
=907×(101-1),
=907×100,
=90700;
(2)0.5×[12.2÷(3.7+2.4)],
=0.5×[12.2÷6.1],
=0.5×2,
=1;
(4)(
+
)×40+
,
=
×40+
×40+
,
=15+8+
,
=23
.
=4500+20,
=4520;
(2)907×101-907,
=907×(101-1),
=907×100,
=90700;
(2)0.5×[12.2÷(3.7+2.4)],
=0.5×[12.2÷6.1],
=0.5×2,
=1;
(4)(
3 |
8 |
1 |
5 |
7 |
15 |
=
3 |
8 |
1 |
5 |
7 |
15 |
=15+8+
7 |
15 |
=23
7 |
15 |
点评:本题主要考查整数、小数和分数的混合运算,要先弄清运算顺序,然后再进行计算,能简算的要简算.
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