a ,2/3 – 5/7 . 14/25 b, -2/5 .5/8 .3/5 c, -7/11 .11/19. -7/11.8/19 + -4/11 d, -5/18 + 5/9 – 11/36 Tìm x X +2/5 =11/15 X+1/2 =3/4 4/5.x=4/7

0 bình luận về “a ,2/3 – 5/7 . 14/25 b, -2/5 .5/8 .3/5 c, -7/11 .11/19. -7/11.8/19 + -4/11 d, -5/18 + 5/9 – 11/36 Tìm x X +2/5 =11/15 X+1/2 =3/4 4/5.x=4/7”

1. Đáp án:a)2/3-2/5

   b)-3/20

   c)-7/11 nhân (11/19- 8/19)+-4/11

   =-7/11 nhân 3/19+-4/11

   =-21/209+-4/11

   =-21/209+-76/209

   =-97/209

   d)-10/36+20/36-11/36

   =-1/36

   1)x+2/5=11/15

   x=11/15-2/5

   x=11/15-6/15

   x=1/3

   2)x+1/2=3/4

   x=3/4-1/2

   x=3/4-2/4

   x=1/4

   3)4/5.x=4/7

   x=4/7:4/5

   x=5/7

    

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