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1、练习一 10+8= 16-8= 5+8= 7+4= 32-11= 2+10= 6+8= 6+6= 2+9= 18-9= 8+4= 15-6= 8+4= 7+7= 16-8= 12-5= 9+7= 15+3= 5+6= 11-3= 3+6= 9+2= 14-9= 18-9= 13-7= 8+10= 10+10 = 6+6= 11+6= 16-16= 练习四 10+50 = 30+30 = 60+30 = 30+40 = 80-60= 90-60= 30+70 = 50+9= 50-40= 20+80 = 7+20= 20+80 = 40-30= 60+8= 30-30= 90+10 = 50+5
2、0 = 50-50= 40+8= 70+20 = 9+40= 60+40 = 10+40 = 9+30= 50-50= 90+4= 5+60= 10+90 = 30+8= 40+60 = 练习二 5+8= 16-8= 13+7= 11-9= 11-3= 14+5= 4+7= 18-8= 12-9= 19-9= 3+10= 17-7= 14+6= 12+8= 20-20= 14-7= 15-6= 4+9= 9+9= 10-3= 13-8= 11-3= 5-5= 19-9= 6+6= 12+4= 14-6= 13-7= 11-9= 3+14= 练习六 67-6= 34+2= 18+1= 38-6=
3、 26+3= 19-9= 12+6= 75+3= 5+42= 38-8= 84+3= 18-4= 24+5= 26+1= 7+31= 32-2= 2+33= 8+20= 18+2= 14+5= 88+1= 95+4= 2+64= 87-5= 29-3= 3+52= 48+1= 47-6= 4+15= 9+50= 练习三 15-2= 3+16= 12+3-9 = 12-9= 16-8= 2+8-6= 17-6= 12-3= 6-6+3= 6+9= 11-3= 7+8-9= 3+4+9 = 11-7= 4+8-3= 12+3+ 5= 6+9-5= 9+3-2= 20-10+ 3= 2+9-6= 1
4、5-6+3 = 14-6+812+6-813+7-6 = = = 18-5+6 = 3+7+8 = 19-3+4 = 10-1+1 5= 7+8-4= 20-20+ 8= 练习五 52+30 = 42+50 = 28+60 = 36+20 = 50+50 = 90+8= 85+10 = 36-20= 24+70 = 99-90= 49-40= 36+40 = 19+50 = 83-60= 84-80= 48-30= 78+20 = 26+70 = 49+50 80-40= 36+40 = 55-50= 42-40 27+20 = 64-60= 88-80= 49-20= 87-50= 76+1
5、0 76-70= 练习七 42+25 = 21+12 = 84-33= 36+42 = 46-30= 27+32 = 76-25= 42-25= 68-53= 36+12 = 46+32 = 26-14= 95-42= 23+52 = 99-45= 89+10 = 55-42= 36+63 = 34+24 = 6+52= 45+54 = 16+31 = 27-15= 72+13 = 84+13 = 27+61 = 9+50= 25+61 = 22+36 = 16+82 = 练习十 25+35 = 36+44 = 45+17 = 28+23 = 66+27 = 58+43 = 42+19 = 39+25 = 37+19 = 26+14 = 17+25 = 67+23 = 35+47 = 34+48 = 16+14 = 15+75 = 78+13 = 38+56 = 74+26 = 29+16 = 46+5= 63+8= 36+1420+38