文档介绍：×7= ×100= ×4= ×4=
4×= 430-250= += -=
7200÷800= += -= 17×300=
-= += 600×= +=
+= 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= -=
×4= 0. 07×= 33×= ×4=
×= 15×= ×= ×=
54×= ×= ×= ×100=
×= ×= 25×= ×=
6×= ×= ×= ×=
×= ×= ×= ×20=
4