Đáp án:
Giải thích các bước giải:
2.
`0,25 + 1/2 - | -3/4|`
`= 1/4 + 1/2 - 3/4`
`=3/4 - 3/4 `
`=0`
`|-3/4 + 1 | -1/5 + | 1/10 - 3/20|`
`=| -3/4 + 4/4| - 1/5 + | 2/20 - 3/20|`
`= 7/4 - 1/5 + 1/20`
`=35/20-4/20+1/20`
`=32/20`
3.
`A= 4 8/15 - (2/5 -3 1/3) + | 1/2 - 4/5 |`
`A=68/15 - ( 2/5 - 10/3) + 3/10`
`A=68/15- (-44)/15 + 3/10`
`A=112/15 + 3/10`
`A=233/30`
C= ( -5/12 + 7/4 - 3/8 ) - | 4 1/2 - 7 1/3 | `
`C = ( 4/3 - 3/8 ) - | 9/2 - 22/3|`
`C=23/24 - 17/6 `
`C=-15/8`
