Đáp án + Giải thích các bước giải:
Câu `16` :
`6 3/5 - 6 2/5=6+3/5-(6+2/5)`
`=6+3/5-6-2/5=1/5->C`
Câu `17` :
`1/6:(0,75+1/6)-50%*(-1)^2`
`=1/6:(3/4+1/6)-50/100*1`
`=1/6:(18/24+4/24)-1/2*1`
`=1/6:22/24-1/2`
`=1/6*24/22-1/2`
`=1/6*12/11-1/2`
`=1/1*2/11-1/2`
`=2/11-1/2`
`=4/22-11/22=-7/22->D`
Câu `18` :
`5/9*10/11+5/9*15/11-5/9*14/11`
`=5/9(10/11+15/11-14/11)`
`=5/9*11/11=5/9*1=5/9->A`.
