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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×=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+=630÷9= -= -5=330×9=
-= -=+= 1-= +=
+= +4= 4-=+= +=
+=23×100= -= 480÷40=÷100=
+= 125×80=÷10= += 70×12=
×100= -= -=×10= 10+=
1-=×1000= += +=×100=
-= -=63÷100= -= +=
80÷1000= += -=30×100= -=
+=+= 5+= 1-=+=
+
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