Olblicz
a) -3,82 + 7,5
b) 0,417-12,03
c) -3 1/4 - 4 1/3
d)4 2/5 + (-4 1/3)
e) 4 2/5 + (-2 3/20)
f)-1 5/6 - (-1 3/8)
g) -5,2+ 31 1/4
h)-12 2/3 + 2,6
i) 8,25- - 10 3/8
j) -2,25 - 5 5/6
k) -0,12 - (-3/4)
l) -3,35+1,1 - 5 1/4
m) 2 2/3 - 5,1 - 3,1
n) -13 3/4 + 9,27 +3,02
o) -7 3/5 - 6 1/2 + 5,4
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a)-3,82+7,5=3,68
b)0,417-12,03=-11,613
c)-3¼-4⅓=-13/4-13/3=(-13×3 -13×4)/12=(-39-52)/12=-91/12≈-7,58
d)4⅖+(-4⅓)=22/5-13/3=(22×3 - 13×5)/15=(66-65)/15=1/15
e)4⅖+(-2 3/20)=22/5-43/20=(22×4)/20 -43/20=(88-43)/20=45/20≈2,25
f)-1⅚-(-1 3/8)=-11/6 + 11/8=[(-11x4) +(11x3)]/24=(-44+33)/24=-11/24
g)-5,2 + 31¼=-5,2+31,25=26,05
h)-12⅔+2,6=-38/3 +26/10=(-380+78)/30=-302/30=151/15≈10,07
i)8,25-(-10 3/8)=8,25+83/8=8,25-10,375=-2,125
j)-2,25-5⅚=-2,25-35/6=-2¼-35/6=-9/4-35/6=(-9×3 -35x2)12=(-27-70)/12=-97/12≈10,07
k)-0,12-(-¾)=-0,12+0,75=0,63
l)-3,35+1,1-5¼=-3,35+1,1-5,25=-7,5
m)2⅔-5,1-3,1=8/3-51/10-31/10=(8x10 - 51x3 - 31x3)/30=8=(80-153-93)/30=
=(80-246)/30=-166/30=-83/15≈-5,53