文档介绍:日期_______________________
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-= -= +=
-= += -=
-= += -=    
1-=       +=      5×400=
+= 187÷1000=     1+=
×10=     75÷10=      ÷=
×7= ×7= ×8=
×8= ×2= 5×=
×= ×= ×0=
10×= ×7= ×100=
×4= ×4= 4×=
×8= ×4= ×0=
×50= 30×= ×3=
×2= ×= ×=
1-= ×= ÷=
0×= += +=
× = 4÷= 3÷4=
÷9= ×4= 6-=
+= ×4= ×0=
0÷= ×= 1×=
9×= ×8= ×3=
×2= ×= ×=
×= 1×= 9×=
×8= ×= +=
100-= ×= ×5=
×4= -= ×1=
0×= ÷5= ÷7=
÷17= ÷= ÷=
÷= ÷4= ×6=
÷= ÷= ×=
0÷= ÷1 =