Đáp án:
Giải thích các bước giải:
`a, 1/5 + (-1/3 + 9/5 )+(-7/6)`
`=1/5 + ([(-1).5]/3.5 + (3.9)/(3.5))-7/6`
`=1/5 + [(-5)/15+27/15]- 7/6`
`=1/5 + (27-5)/15 - 7/6`
`=1/5 + 22/15 -7/6`
`=3/15 + 22/15 - 7/6`
`=25/15 -7/6`
`=5/3 - 7/6`
`= 10/6 - 7/6`
`=3/6`
`=1/2`
`b, (12/13 +7)+(-8 + 1/13)`
`= (12/13 +91/13) + (-104/13 +1/13)`
`=103/13 + (-103)/13`
`=0`
`c, (-4/5 +2/3 )+(-5/4 +14/5)+(7/3-2)`
`=(-12/15 + 10/15)+(-25/20 + 56/20 )+(7/3 - 6/3)`
`=-2/15 + 31/20 + 1/3`
`=-8/60 + 93/60 + 20/60`
`=(-8+93+20)/60`
`=105/60`
`=7/4`
`d, -8 + (-3)/5 + 7/10+9+(-33)/30`
`=(-80)/10 + (-6)/10 + 7/10 + 90/10 + (-11)/10`
`=(-80-6+7+90-11)/10`
`=0/10`
`=0`
