文档介绍：-
z.
×4= 0. 07×= 33×= ×4=
×= 15×= ×=
-= -= -= 10+=
-= += += -=
-= 1-= -=-=
-= += -= -=
+0= ×8= ×4= ×0=
×50= 30×= ×3= ×2=
×= ×=×2= ×10=
×8= ×10= ×= +=
+= ×2= ×= 6×=
-
z.
-= ×100= ×= ×=
×100=÷= ×8= ÷2=
÷28= ÷= ×9= ÷24=
×= -= ÷4= ÷13=
+= 10÷20= 24÷15= ×=
+= ×2= －= ×=
6×= －= ×= ×100=
×= ÷= ÷7= ÷100=
÷= ×8= ÷= ÷2=
÷28= ÷= ÷= ÷=
÷12= ×= += －=
÷4= ÷13= ÷5= ÷41=
10÷20= 24÷15= ×10= ×=
×= ×1000= ×= ×=
÷= ÷9= ÷= ÷2=
÷= ÷= ×100= ×8=
÷= ×4= ×= ÷=
×= ×=÷= ÷=
1÷= ×= ÷= ÷=
÷= ÷= ÷