Działania na liczbach wymiernych - proszę o rozwiązania, a nie same wyniki. Daję naj. b) - 2 3/4 + (-1 1/2) - (-4 1/2) - [ - (-5 1/4) + (-6 2/3)]
c) 2 - (-3,45) + (-7,15) - (-10,125) - 3,425
e) - (-8/9) - (- 7/8) + (-6/7) - (-5/6) - 1 1/7 + 2 1/8 + 5/18
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b) -2i3/4 +(-1i1/2) -(-4i1/2) -[-(-5i1/4) +(-6i2/3) =
-2i3/4 -1i1/2 +4i1/2 -[ 5i1/4 - 6i2/3] =
-2i3/4 +3 -[5i3/12 - 6i8/12] =
-2i3/4 + 2i4/4 -[5i3/12 -6i8/12] =
1/4 - [-1i5/12]= 3/12 + 1i5/12 = 1i8/12 = 1i2/3
c) 2 -( -3,45) +(-7,15) -(-10,125) - 3,425 =
2 + 3,45 -7,15 +10,125 -3,425 = 15,575 - 10,575 = 5
e) -(-8/9) -(-7/8) +(-6/7) -(-5/6) - 1i1/7 +2i1/8 +5/18 =
8/9 +7/8 -6/7 +5/6 -1i1/7 +2i1/8 +5/18 =
8/9 +2i8/8 - 1i7/7 + 5/6 + 5/18 =
8/9 + 3 - 2 +5/6 +5/18 =
16/18 + 1 +15/18 +5/18 = 1 i 36/18 = 3
od razu opuszczam nawiasy i sprowadzam do wspólnego mianownika
b) -2i3/4-1i2/4+4i2/4-[5i3/12-6i8/12]=
-3i5/4+4i2/4-(-1i5/12)=
1/4+1i5/12=3/12+1i5/12=1i8/12=1i2/3
c) 2+3,45-7,15+10,125-3,425=15,575-10,575=5
e) 8/9+7/8-6/7+5/6-1i1/7+2i1/8+5/18=
8/9+3-2+5/6+5/18=16/18+1+15/18+5/18=36/18+1=2+1=3