题目内容

(2007?绵阳)
脱式计算,能简算的要简算
(0.32÷16+1.08)÷22
1
3
×
4.5÷(0.75+1
1
4
8÷[(40.75-9.5)×0.4]+9.36
16
27
×
1
7
+
5
27
÷7
100.6-45.75+29.4-14.25 1.25×99
3
5
×0.8
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.
解答:解:(1)(0.32÷16+1.08)÷22,
=(0.02+1.08)÷22,
=1.1÷22,
=0.05;

(2)
1
3
×
4.5÷(0.75+1
1
4
),
=
1
3
×
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)
16
27
×
1
7
+
5
27
÷7,
=
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
×0.8

=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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