题目内容
(2007?绵阳)
脱式计算,能简算的要简算 (0.32÷16+1.08)÷22 |
|
8÷[(40.75-9.5)×0.4]+9.36 | ||||||||
|
100.6-45.75+29.4-14.25 | 1.25×99
|
分析:(1)(2)(3)根据四则运算的计算法则进行计算,
(4)根据乘法分配律进行计算,
(5)根据一个数连续减两个数,等于减去这两个数的和,进行计算,
(6)根据乘法结合律进行计算.
(4)根据乘法分配律进行计算,
(5)根据一个数连续减两个数,等于减去这两个数的和,进行计算,
(6)根据乘法结合律进行计算.
解答:解:(1)(0.32÷16+1.08)÷22,
=(0.02+1.08)÷22,
=1.1÷22,
=0.05;
(2)
×4.5÷(0.75+1
),
=
×4.5÷2,
=0.75;
(3)8÷[(40.75-9.5)×0.4]+9.36,
=8÷[31.25×0.4]+9.36,
=8÷12.5+9.36,
=0.64+9.36,
=10;
(4)
×
+
÷7,
=
×
+
×
,
=(
+
)×
,
=
×
,
=
;
(5)100.6-45.75+29.4-14.25,
=100.6-45.75-14.25+29.4,
=100.6-(45.75+14.25)+29.4,
=100.6-60+29.4,
=70;
(6)1.25×99
×0.8,
=1.25×0.8×99
,
=99
.
=(0.02+1.08)÷22,
=1.1÷22,
=0.05;
(2)
1 |
3 |
1 |
4 |
=
1 |
3 |
=0.75;
(3)8÷[(40.75-9.5)×0.4]+9.36,
=8÷[31.25×0.4]+9.36,
=8÷12.5+9.36,
=0.64+9.36,
=10;
(4)
16 |
27 |
1 |
7 |
5 |
27 |
=
16 |
27 |
1 |
7 |
5 |
27 |
1 |
7 |
=(
16 |
27 |
5 |
27 |
1 |
7 |
=
21 |
27 |
1 |
7 |
=
1 |
9 |
(5)100.6-45.75+29.4-14.25,
=100.6-45.75-14.25+29.4,
=100.6-(45.75+14.25)+29.4,
=100.6-60+29.4,
=70;
(6)1.25×99
3 |
5 |
=1.25×0.8×99
3 |
5 |
=99
3 |
5 |
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律简便计算.
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