(1)×39 + ×25 + ×(2)1×(2 - )+ 15÷
简算 4.9+0.1﹣4.9+0.1 10.78﹣(2.78+3.693) 99.99×22.22+33.33×33.34 (2.5×2.5+2.5×2.5+2.5×2.5+2.5×2.5)×8.
计算
根据46×15=690,1575÷15=105,直接写出下面各题的结果. 4.6×15= 0.46×0.15= 15.75÷0.15= 15.75÷1.5= .
看图列式,不计算