1--= +-= +-2= +=
0.3χ= 45 χ+χ=28 χ- =
++ +- ++ 2--
+++ -(-) += += 1-= -= += -= += 1-= Ⅹ-= +Ⅹ= 2Ⅹ-= +(-) 2-- -+
68- 7.5 + 32-2.5 -( -)
+= -= += += -= += -= --= +-= 7-= ++= ++= 1--= X+= —x = X-(-)=
++ 1-- +++ -(-)
-(+) +++ 0.15×0.6= 7÷40= 2-= += += 1.2÷2.4= -= 0.÷8= 0.75÷0.25= 10-0.06= += 12.5×80= += 0.53= += 5— = χ+ = χ- = χ-=1
-(+) -(+) + + +
7- - + + 6- (- )
+= += -= -= 1+=
+= -= += += -=
+= 1-= -= += +=
6= 5= 0.125×8= 6.25×13= 28÷56=
χ+ = 4χ-1.6χ=36 X+=
7.8-8.75+2.2-1.25 7.8×1.17-7.8×0.17
7-- -(+) +(-)
+= -= -= 5- = 1--=
5÷0.001= 2.5×4= += -= + +=
X+= 2X-=1- 5.5X-3X=15
-(+) -- +++
+- ++ --
+= += 1-= -=
+= -= += 2-=
Ⅹ-= 2Ⅹ-=
+= 1.2÷2.4= -= 0.÷8=
0.75÷0.25= 10-0.06= += 12.5×80=
2.40.03= 0.5+= 7.5-2.5= 0.39÷13=
+= 0.53= += 5— =
x+= x-= x-(+)=
++ 60.62-(9.2+12.62) 6.8++3.2+
-- ++- -(-)
+= += += -= -=
-= += -= 1- = -=
-= += -= += +=
X+= —x = X-(-)=
+(+) +- -(+) 6-(-)
+++ +++ 5-- -(+)
+ = 6.8–0.08= —= 160×5=
1.44÷9= + = 2.76×100= 8.7–1.9–3.1=
+ 1 = - = 0.14×6= 48÷0.6=
0.15×0.6= 7÷40= 2-= +=
Ⅹ-= +Ⅹ= Ⅹ-=
++ +- 2-(+)
+- +++ -(-)
2-=
20=
χ-860=260 x-=
15χ=6 6.8+χ=70
6--
+ = 1 - = - = 0.9×100= + =
0.÷16= 10-9.12= 0.7÷3.5= 0.8×125= + =
x + = - x= 4x - =2-
3 - - - 7.8×1.17-7.8×0.17 10- -
+ - + 0.25+ + + + +
0.5×20= 0.35÷5= 2.2-2= 0.06÷3=
2.5+3.5= 1.5÷0.5= 12.2+0.2= 1.35×4=
+= += 1-= -=
+= -= += 1-=
Ⅹ-= +Ⅹ= 2Ⅹ-=
++ 1--
+++ -(-)
+- +(-
+= += 0.32= -= 4÷6=
-= +0.2= -1= 1-= +=
+= += 0.32= -= 4÷6=
x+ =1 X- = x -(+)=
3 - - - 10- -
+ - + 0.25+ + +
-= +0.2= -1= 1-= +=
+= 12.5×8= 14-22= -= 0÷=
0.25+0.4 2.4+0.06= 0×= 2-= -=
+= 12.5×8= 14-22= -= 0÷=
x + = - x= 4x - =2-
1-