已知三角形的两个角分别是85°和30°,那么另一个角是 °.
已知376×15﹦5640,那么5640÷15﹦ ,5640÷376﹦ .
除以2.7的商是0.08.
× =÷ =1× = ﹣=1.
÷ =× =0.2× =0.5: =1.
1× = ﹣2= ×2.1=1.