文档介绍:-23+5= +9-5= -7-12= -25-21=
11-19= 22-37= -45+24= -63+28=
15-55= -7-11= -5-21= 6-19=
23-31= -4+29= -6+18= +9-15=
-17-19= -25-11= 7-16= 3-42=
-29+21= -16+17= 32-17= -28-9=
-27-24= 18-19= 5-12= -19+20=
-25+12= +23-28= -5-8= -7-19=
6-11= 15-6= -11+7= -8+42=
37-82= --= --= -=
= = = =
8×= ÷12= 7-= ÷2=
÷2= 200×= += 540÷900=
÷9= += ÷= ×100=
-= 11×25= ÷= 10÷20=
540÷900= ÷= ÷= ×=
6÷20= ×= ÷= 800 ×=
-= += 7-= -4=
×4= 800×= ÷3= 11×25=
8÷÷400= ÷9= 49×= 12×25=
÷41= -= ÷÷= +=
÷÷= ×400= 200×= ÷=
×= 10÷20= ×= ÷=
×7= += ÷100= 7-=
÷+= ×= += ×3=
×5= += ×50= ×+×=
+= ÷= += -=
7÷= ÷= ÷13= +=
÷4= ×3= ×+×= 140÷200=
÷= ÷5= ×= ×=
7-= ×4= += 10÷=
5×= 140÷20