Oblicz w pamięci:
a)
-12+(-11)=
-50+25=
-101+(-120)=
b)
-7+42=
-101+84=
-106+120=
c)
-16+3=
99+(-19)=
-27+31=
d)
-8(1/2)+6=
-3/4+(-3/4)=
-3(5/7)+3/7=
e)
-13+5,6=
-6,2+(-2,6)=
-0,75+(-1,3)=
f)
-2+1/2=
-0,5+1(1/2)=
0,75+(-3/4)=
Wyjaśnienie :
-8(1/2) - Osiem i jedna druga
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a)
-12+(-11)= -23
-50+25=-25
-101+(-120)=-221
b)
-7+42=35
-101+84=-17
-106+120=14
c)
-16+3=-13
99+(-19)=80
-27+31=4
d)
-8(1/2)+6= - 2 (1/2)( minus dwie i jedna druga)
-3/4+(-3/4)= 1 ( 1/2) (minus jedna i jedna druga)
-3(5/7)+3/7= - 3 (2/7) (minus trzy i dwie siódme)
e)
-13+5,6= 7,4
-6,2+(-2,6)= 8,8
-0,75+(-1,3)=2,05
f)
-2+1/2=1(1/2) ( minus jeden i jedna druga)
-0,5+1(1/2)= 1
0,75+(-3/4)=0
a)
-12+(-11)= -23
-50+25= -25
-101+(-120)=-121
b)
-7+42= 35
-101+84= -17
-106+120= 14
c)
-16+3= -13
99+(-19)= 80
-27+31= 4
d)
-8(1/2)+6=-2
-3/4+(-3/4)=-1.5
-3(5/7)+3/7= -3 2/7
e)
-13+5,6= -7,4
-6,2+(-2,6)=- 8,8
-0,75+(-1,3)= -2,05
f)
-2+1/2= -1,5
-0,5+1(1/2)= 0.5
0,75+(-3/4)=0