题目内容
口算下面各题.
1-25%=
15%-8%=
1-9%=
1-25%=
75%
75%
1+75%=175%
175%
15%-8%=
7%
7%
150%-1=50%
50%
1-9%=
91%
91%
1+45%=145%
145%
.分析:把1看做100%,百分数相加减时,分母不变,即百分号不变,把分子相加减即可算出得数.
解答:解:1-25%=75%,
1+75%=175%,
15%-8%=7%,
150%-1=50%,
1-9%=91%,
1+45%=145%.
故答案为:75%,175%,7%,50%,91%,145%.
1+75%=175%,
15%-8%=7%,
150%-1=50%,
1-9%=91%,
1+45%=145%.
故答案为:75%,175%,7%,50%,91%,145%.
点评:本题考查百分数的加减法,分母不变,即百分号不变,把分子相加减.
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