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整理文档
-= -= +=
-= += -=
-= += -=
1-= += 5×400=
+= 187÷1000= 1+=
×10= 75÷10= ÷=
×7= ×7= ×8=
×8= ×2= 5×=
×= ×= ×0=
10×= ×7= ×100=
×4= ×4= 4×=
430-250= += -=
7200÷800= += -=
17×300= -= +=
600×700= += +=
670+250= += -6=
8500÷500= -= +=
25×100= -= 2+=
380-290= += +=
3500÷70= +3= +=
7500÷250= +1= -=
450+780= += 3+0