13-9= 60-10= 14-5= 76-6= 20+20= 30+15= 15-6= 38-2= 79-60= 80-4- 56+7= 41-0= 47-30= 0+32= 52+3= 45-21= 12-2= 30+10= 6+50= 28-10= 59-9-20= 48+(18-9)= 56-6-10= 80-(33+7)= 94-40+4= 70-3= 34+4= 74+7= 90-9= 19+4= 3+65= 17+3= 10+28= 45-8= 54-50= 16-9= 75-60= 60+30= 17+5= 58-6= 50-9= 24+9= 6+70= 43-30= 26+40= 90-(68-60)= 34-5+30= 75-(10+50)= 54+5-7= 74-(45-40)=- 42-4= 14+40= 72-20= 14-11= 10+50= 17+40= 90-80= 32+40= 87-7= 72+6= 18-9= 20+48= 98-60= 74+4= 29+8= 64+7= 52-5= 39+20= 20+5= 70-30= 36+20+2= 70-(12-6)= 50+(!6-9)= 43-(3+27)= 76-6-8= 21-10= 16+50= 26+8= 13-11= 41-6= 60-8= 37+6= 27+20= 82-40= 38+9= 93-90= 100-70= 85-5= 6+60= 61+7= 40+20= 39-9= 4+80= 76+20= 11-4= 47+(18-9)= 63+6-30= 16-9+8= 94-(52+8)= 48+20-5= 口 算 练 习 （一）班级姓名时间21+3= 20+9= 63-50= 92-20= 78-9= 30+10= 70-50= 58+20= 33-4= 33+40= 50-30= 75-7= 55-4= 45+20= 59-9= 35-6= 60+30= 5+17= 40-20= 18+50= 67+(24-4)= 13-(4+4)= 43-8-3= 80-(50-30)= 7+8+40= 59-6= 21+30= 33+7= 43-10= 21+6= 50-6= 32+9= 7+27= 43-9= 50+4= 24+30= 56-30= 35-9= 78+6= 74-60= 35+9= 98-6= 69+4= 15-8= 84-8= 42-40-2= 54-(20+10)= 51-40+6= 17+(38-8)= 38+5-20= 24-4= 96-60= 25+6= 63-8= 67-7= 43+5= 47+30= 72-5= 36+7= 78-30= 57+2= 45-8= 67+20= 80-30= 30+70= 34+9= 97-30= 55-6= 65-3= 3+90= 11-4-4= 20+23+8= 92-(9-5)= 28+2+16= 80-(30+20)= 42+20= 34+7= 5+38= 86-7= 28-7= 72-9= 67-40= 98-8= 40+14= 18-10= 30+40= 90-80= 20+6= 8+30= 69-60= 5+35= 72+9= 60+8= 45+20== 40+60= 95-(58-50)= 19-5-4= 79-(5-3)= 48-6-30= 18-9-9= 口 算 练 习 （二）班级姓名时间57-3= 60-50= 54-4= 94-4= 57+3= 52-5= 80-50= 50+5= 35+9= 45-7= 53+7= 64-30= 75+20= 29+40= 31+40= 30+6= 25-9= 35+8= 30-3= 23+6= 65-(4+3)= 24+3-6= 70+20+10= 54+(17+3)= 50+17-8= 16-8= 17-9= 20-11= 86+4=66-8= 24+30= 78-9= 38-8= 54+8= 30+15= 76-30= 20-9= 20+62= 57-3= 36-0=...
