文档介绍：57-28 =
801X9=
57-28 =
801X9=
三年经数学口算练习题
120-40=
402X5=
25X 4=
450X0= 360-90=
11 + 60 = 630X3= 560+40= 72-24 =
9+50 = 630+ 70= 120X5=
24 X 5= 70X 8=
250X5=
57-28 =
801X9=
57-28 =
801X9=
14+40 =
880X2=
40X 8=
120+20=
42+30 =
72X3=
250X1 =
28+68 =
100X0=
30X 6=
18X3=
902X1 =
17X 4=
68-4 =
48- 16 =
70X 2=
200X8=
280-70=
320X8=
30X 6= 180-60=
140-5=
125X8=
560+ 80=
150X2=
700X2=
120+20=
42+30 =
72X3=
902X6=
590+ 70=
800X5=
440 X 0=
25+ 16 =
303X3=
12X2= 470+ 70=
64X0=
25X8=
72X6=
20X6=
90X3=
420X6=
280+40=
55X 5= 48X4=