整十数加、减整十数课后练习练习十四2+3= 4+5= 2+3= 4+5=20+30= 40+50= 20+30= 40+50=6-4= 7-3= 6-4= 7-3=60-40= 70-30= 60-40= 70-30=2+3= 4+5= 2+3= 4+5=20+30= 40+50= 20+30= 40+50=6-4= 7-3= 6-4= 7-3=60-40= 70-30= 60-40= 70-30=2+3= 4+5= 2+3= 4+5=20+30= 40+50= 20+30= 40+50=6-4= 7-3= 6-4= 7-3=60-40= 70-30= 60-40= 70-30=2+3= 4+5= 2+3= 4+5=20+30= 40+50= 20+30= 40+50=6-4= 7-3= 6-4= 7-3=60-40= 70-30= 60-40= 70-30=