Question

Calculati:
a)(+7/18)+(-3/2)+(-11/9)+(+4/1)
b)(-3/8)+(+1/16)+(-1/2)+(-3/4)
c)2(intregi)1/5-2(intregi)1/2
d)(-7/9)-(-2/5)-(-1/15)-2/45
e)(-7/36+[(-2/9)+(-5/18)-(+1/2)]
f)5/12-(-5/6)+1/3
g)5/12-(-5/6)+1/3
h)(-7/18+2(intregi)1/9)-(-3(intregi)1/2+4)
i)-19/15-(7/30-3/10)
j)29/30-0,2(5)+27/5-0,3(1)
k)23,4+(-54,4)
l)18,23-5,23-1,(2)
Ajutati-ma va rog!

Answer 1

7/18+(-3/2)+(-11/9)+4/1=7/18-3/2-11/9+4=(7-3•9-11•2)/18+4=(7-27-22)/18+4=-42/18+4=-7/3+4=-2 intregi1/3+4=1 întreg 2/3

b)(-3/8)+1/16+(-1/2)+(-3/4)=(-3•2+1-1•8-3•4)/16=(-6+1-8-12)/16=-25/16=-1 intreg9/16

c)2 întreg 1/5-2 intregi1/2=(2intregi-2intregi)+(1/5-1/2)=(1•2-1•5)/10=(2-5)/10=-3/10

d)-7/9-(-2/5)-(-1/15)-2/45=-7/9+2/5+1/15-2/45=(-7•5+2•9+1•3-2)/45=(-35+18+3-2)/45=-16/45

e)-7/36+[(-2/9)+(-5/18)-1/2]=-7/36+(-2•2-5-1•9)/18=-7/36+(-4-5-9)/18=-7/36-18/18=-/36-1=-1 întreg 7/36

f)5/12(-5/6)+1/3=5/12+5/6+1/3=(5+5•2+1•4)/12=(5+10+4)/12=19/12=1 intreh7/12

g)ai scrisoare pe f

h)(-7/18+2 intregi1/9)-(-3 întregi)1/2+4)=(-7/18+19/9)-(-7/2+4)=(-7+19•2)/18-(-1/2)=(-7+38)/18+1/2=(-31+1•9)/18=(-31+9)/18=-22/18=-11/9=-1 intreg2/9

i)-19/15-(7/30-3/10)=-19/15-(7-3•3)/30=-19/15-(7-9)/30=-19/15-2/30=-19/15-1/15=-20/15=-4/3= -1 intreg1/3

j)29/30-0,2(5)+27/5-0,3(1)=(29+27•6)/30-(25-2)/90-(31-3)/90=(29+162)/30-23/90-28/90=191/30-51/90=(191•3-51)/90=(573-51)/90=522/90=29/5=5 întregi 4/5

k)23,4+(-54,4)=-31
l)18,23-5,23-1,(2)=13-(12-1)/9=13-11/9=13-1 intreg 2/9=11 întregi 7/9