下列各式中，计算正确的是（）_刷题宝

题干

下列各式中，计算正确的是（）

A：－2－3＝－1

B： $- 2 m^{2} + m^{2} = - m^{2}$

C：3÷ $\frac{5}{4}$ × $\frac{4}{5}$ ＝3÷1＝3

D：3a+b=3a

上一题下一题 0.0难度选择题更新时间:2019-12-06 10:49:45

答案(点此获取答案解析）

B

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