×= ÷= ×= ÷=
÷= ÷4= ×= 5÷=
÷= ÷= ×2= ×13=
×= = ×= += 1-=
+= -= ×= ÷=
+= -= += -=
÷= 18×= ×3= ×=
×= ÷= += ×=
15÷12= ×12= ÷5= ×=
28×= ×14= ×= ÷=
24×= ÷= -= ÷=
÷8= += ×= ×=
2×= ×3= ÷= ×=
×20= -= ×36= +=
6×= ×= ÷= 2÷=
33÷= ×= ×4= ÷=
+= 7÷= ÷= ××8= -= ( +)×12= ×= ×= -+= 3+-3+= -= ×81=(精品文档请下载)
78+216= -= += 2×2= ×9+= ×= 2= -= ÷7=(精品文档请下载)
1×8= = 5-= ×= 2-×2= - = ÷= (精品文档请下载)
×= += += 12-=
×= ×3 = ÷ = ÷=(精品文档请下载)
×15 = 0÷= -= ×2=
1.×= 2.×= ×= 4.+3=
5.÷= 6.÷4= 7.×= ÷=
9.÷= 10.÷= 11.×2= 12.×13=
13.×= 14.÷3= ×= 16.÷=
÷6= 18.÷5= 19.×18= 20.÷=
×= 22.×2= 23.×= 24.÷=
÷= 26.×= 27.+= 28.×=
29.÷8= 30.+= 31.×15= 32.+=
33.×= ×= ÷= 36.÷4=
-= 38.-= 39.÷= 40.×27=
41.×3= 42.-= 43.×8= 44
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