题目内容
7.5+2.5×3.25=10×3.25=32.5
错误
错误
．分析：本题按照先算乘法，再算加法的运算顺序计算出结果与32.5比较即可．
解答：解：7.5+2.5×3.25，
=7.5+8.125，
=15.625；
15.625≠32.5；
故答案为：错误．
=7.5+8.125，
=15.625；
15.625≠32.5；
故答案为：错误．
点评：一个算式里，如果含有两级运算，要先做第二级运算，后做第一级运算．
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求未知数x有值．
| 5x-1.5×2.5=3.25 | （x-3）：2.5=4：5． |