题目内容
根据题的特点灵活选择方法计算:
+55%
26.5×20%+
×13.5
11.8-(
+30%)
25×12.5×80%
35×10%+18.5÷50%
×24-3.2÷25%
4 |
5 |
26.5×20%+
1 |
5 |
11.8-(
5 |
2 |
25×12.5×80%
35×10%+18.5÷50%
2 |
3 |
分析:(1)先化为小数,再计算即可;
(2)根据乘法分配律简便计算;
(3)先化为小数,再计算即可;
(4)根据乘法结合律简便计算;
(5)先算乘除,再算加法;
(6)先算乘除,再算减法.
(2)根据乘法分配律简便计算;
(3)先化为小数,再计算即可;
(4)根据乘法结合律简便计算;
(5)先算乘除,再算加法;
(6)先算乘除,再算减法.
解答:解:(1)
+55%=0.8+0.55=1.35;
(2)26.5×20%+
×13.5,
=(26.5+13.5)×0.2,
=40×0.2,
=8;
(3)11.8-(
+30%),
=11.8-2.8,
=9;
(4)25×12.5×80%,
=25×(12.5×80%),
=25×10,
=250;
(5)35×10%+18.5÷50%,
=3.5+37,
=40.5;
(6)
×24-3.2÷25%,
=16-12.8,
=3.2.
4 |
5 |
(2)26.5×20%+
1 |
5 |
=(26.5+13.5)×0.2,
=40×0.2,
=8;
(3)11.8-(
5 |
2 |
=11.8-2.8,
=9;
(4)25×12.5×80%,
=25×(12.5×80%),
=25×10,
=250;
(5)35×10%+18.5÷50%,
=3.5+37,
=40.5;
(6)
2 |
3 |
=16-12.8,
=3.2.
点评:考查了百分数的加减乘除运算,运算定律与简便运算,关键是将分数,小数,百分数统一为一种形式.
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