小学数学四年级上册第五单元《口算除法》PPT课件维语.ppt
, ,1. :, ,90 ( ) 10 .80 ( ) 10 .204=80 ( )( ) ( ) .703=210 ( )( ) ( ) .603=20 ( ) - ( ) ( ).,9,8,4,20,80,3,70,210,60,3,20,2. :,20 4 = 80 4 = 30 7 = 210 7 =,80,210,20,30,81 8 122 4 ,80,120,10,30,3. :, 20,80 ,60 20= 90 30= 80 40=,3,3,2,20 3= 30 3= 40 2=,60,90,80, ,80 3 ., 20, 19,80 19 ., : 4 5 .,62 20 93 30 80 38,3,3,2,60,90,40,60 20= 90 30= 80 40=,3,3,2, , , :,20,60,64,40,160,163,240,239,80,6020=,6420,16040=,16340,24080=,23980, 80-13- 3-4-,-,