题目
口算
69-7= 3+73= 4+56= 65+7= 56-7=
23+60= 57-6= 98-70= 24-6= 49+40=
84-3= 55-30= 16+8= 85-40= 50-7=
50-30= 26+9= 13+80= 80-60= 49-8=
40+2=
38-9= 6+64= 81+3= 20+57=
99-9= 50+40= 39+30= 78-20= 14+5=
答案:69-7=62 3+73=76 4+56=60 65+7=72 56-7=49 23+60=83 57-6=51 98-70=28 24-6=18 49+40=89 84-3=81 55-30=25 16+8=24 85-40=45 50-7=43 50-30=20 26+9=35 13+80=93 80-60=20 49-8=41 40+2=42 38-9=29 6+64=70 81+3=84 20+57=77 99-9=90 50+40=90 39+30=69 78-20=58 14+5=19