来自安燮南的问题
【计算:7.81×49-78.1×3.8+0.781×90=______.】
计算:7.81×49-78.1×3.8+0.781×90=______.
1回答
2020-09-21 01:16
【计算:7.81×49-78.1×3.8+0.781×90=______.】
计算:7.81×49-78.1×3.8+0.781×90=______.
7.81×49-78.1×3.8+0.781×90,
=78.1×4.9-78.1×3.8+78.1×0.9,
=78.1×(4.9-3.8+0.9),
=78.1×2,
=156.2
故答案为:156.2.