1.求下列三角形内角度数,填一填。

答案:

180°÷3 = 60° 180° - 73°×2 = 34°
180°÷3 = 60° 180° - 73°×2 = 34°
2.用竖式计算。
55.21+6.89= 22−16.6=
55.21+6.89= 22−16.6=
答案:
3.计算下面各题。
60−(5.76+7.37) 57.2−(13.2−7.06)
2.27+9.41−8.27 43.63+31.9+9.37
60−(5.76+7.37) 57.2−(13.2−7.06)
2.27+9.41−8.27 43.63+31.9+9.37
答案:
60 - (5.76 + 7.37) 57.2 - (13.2 - 7.06)
= 60 - 13.13 = 57.2 - 13.2 + 7.06
= 46.87 = 44 + 7.06
= 51.06
2.27 + 9.41 - 8.27 43.63 + 31.9 + 9.37
= 9.41 + (2.27 - 8.27) = (43.63 + 9.37) + 31.9
= 9.41 - 6 = 53 + 31.9
= 3.41 = 84.9
= 60 - 13.13 = 57.2 - 13.2 + 7.06
= 46.87 = 44 + 7.06
= 51.06
2.27 + 9.41 - 8.27 43.63 + 31.9 + 9.37
= 9.41 + (2.27 - 8.27) = (43.63 + 9.37) + 31.9
= 9.41 - 6 = 53 + 31.9
= 3.41 = 84.9
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