a) 16/9 + 3/5 b)4/13 – -12/7 c)-3/2 + 4/5 d)3/-4 – 1/4 e)2/3 – 1/2 f)3/4 : 15/24 h)31/17 + -5/13 + -8/13 – 14/17 i)4/9 + 1/2 . 2/3 k)1/2 . 3/4 – (3/4

0 bình luận về “a) 16/9 + 3/5 b)4/13 – -12/7 c)-3/2 + 4/5 d)3/-4 – 1/4 e)2/3 – 1/2 f)3/4 : 15/24 h)31/17 + -5/13 + -8/13 – 14/17 i)4/9 + 1/2 . 2/3 k)1/2 . 3/4 – (3/4”

1. Đáp án:

    

   Giải thích các bước giải:a=80/35+27/35=107/35

    b,=28/91-156/91=-128/91

   c=-15/10+8/10=-7/10

   d=-1

   e=4/6-3/6=1/6

   f=3/4.24/15=72/60=6/5

   h=(31/17-14/17)+(-5/13+ -8/13)=1+(-1)=0

   i=4/9+2/6=24/54+18/54=42/54=7/9

   k=3/8-(15/20-16/20)=3/8- -1/20=60/160- -8/160=68/160=17/40

   Trả lời

2. a)16/9+3/5=80/45+27/45=107/45

   b)4/13-(-12/7)=4/13+12/7=28/91+156/91=184/91

   c)-3/2+4/5=-15/10+8/10=-7/10

   d)3/-4-1/4=-3/4-1/4=-4/4=-1

   e)2/3-1/2=4/6-3/6=1/6

   f)3/4:15/24=3/4.24/15=3.24/4.15=6/5

   h)31/17+ -5/13+ -8/13-14/17=(31/17-14/17)-(5/13+8/13)=17/17-13/13=1-1=0

   i)4/9+1/2.2/3=4/9+1.2/2.3=4/9+1/3=4/9+3/9=7/9

    k)1/2.3/4-(3/4-4/5)=3/8-3/4+4/5=15/40-30/40+32/40=-15/40+32/40=17/40

   Trả lời