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= 5