Đáp án:
Giải thích các bước giải:
`a. 3/7+1/2-17/7+3/2`
`=(3/7-17/7)+(1/2+3/2)`
`=-14/7+4/2`
`=-2+2`
`=0`
`b. 1/7+6/7×(1/2-1/3)`
`= 1/7+6/7×1/2-6/7×1/3`
`= 1/7+3/7-2/7`
`= 1/7+1/7`
`= 2/7`
`c. 4/5×19 1/3-4/5×39 1/3`
`=4/5(19 1/3-39 1/3)`
`=4/5.(19+1/3-39-1/3)`
`=4/5.(-20)`
`=-16`
`d.(-2)^3+(75%-0,25):(2 1/4-1 5/6)`
`=-8+(75%-25%):(2+1/4-1-5/6)`
`=-8+50%:(1-7/12)`
`=-8+1/2:5/12`
`=-8+6/5`
`=-34/5`