Question

Wykonaj dzialania:

a) 42-78=

b) -47-(-63)=

c)-240*(-3)=

d)-342+(-139)=

e)7*(-4)-2(-3)(-5)=

f)2*(-5)^2-(-3^2)-(-2)^2=

g)2cale i 2/9-3cale i 5/6+5calei 1/3=

h)(-2/3-(-1/3)=

i)2/3-(-1/3)=

j)-2/3+1/3=

k)2/3-1/3=

l)2/3+3/4-1/5=

m)7/6+(-5/4-4/3)=

Prosze pilnie o pomoc...:)

Answer 1

a) 42-78= = 42 + (-78) = - 36

b) -47-(-63)= - 47 + 63 = 16

c)-240*(-3)=  720

d)-342+(-139)= - 481

e)7*(-4)-2(-3)(-5)= (-28) - 2 * 15 = -28 - 30 = -28 + (-30) = -58

f)2*(-5)^2-(-3^2)-(-2)^2= 2 * 25 - (-9) - 4 = 50 + 9 - 4 = 55

g)2 i 2/9-3 i 5/6+5 i 1/3= 2 i 4/18 - 3 i 15/18 + 5 i 6/18 = - 1 11/18 + 5 i 6/18 = 5 i 6/18 - 1 i 11/18 = 4 i 24/18 - 1 i 11/18 = 3 i 13/18

h)(-2/3-(-1/3)= (-2/3) + 1/3 = - 1/3

i)2/3-(-1/3)= 2/3 + 1/3 = 3/3 = 1

j)-2/3+1/3=  - 1/3

k)2/3-1/3= 1/3

l)2/3+3/4-1/5= 8/12 + 9/12 - 1/5 = 17/12 - 1/5 = 85/60 - 12/60 = 73/60 = 1 i 13/60

m)7/6+(-5/4-4/3)= 7/6 + (-15/12 - 16/12) = 7/6 + (- 31/12) = 14/12 + (- 31/12) = - 17/12 = -1 i 5/12