`[-3 3/7+3 4/11]÷(1 4/11)+[-5 4/7+5 7/11]÷(-1 7/11)`
`=[-3+(-3/7)+3+4/11]÷(15/11)+[-5+4/7+5+7/11]÷(-18/11)`
`=[(-3+3)+(-3/7+7/11)]÷(15/11)+[(-5+5)+(-4/7+7/11)]÷(-18/11)`
`=[0+16/77]÷(15/11)+[0+5/77]÷(-18/11)`
`=16/77÷15/11+5/77÷(-18/11)`
`=16/77×11/15+5/77×(-11/18)`
`=(16×11)/(77×15)+(5×(-11))/(77×18)`
`=(16×1)/(7×15)+(5×(-1))/(7×18)`
`=16/105+(-5/126)`
`=71/630`
Chúc bạn học tốt!!!