5 4/7: 1 5/21-(5 2/15*3/22+1 14/15)=39/7*21/
1)<span>5 4/7: 1 5/21 =39/7*21/26 =3*3/2 =9/2
2)77/15*3/22=7/5*1/2=7/10
3)7/10+29/15= 79/30
4) 9/2-79/30=56/30=28/15= 1 целая 13/15
</span>
3х+8+х=41
4х=41-8
4х=33
х=8,25
<span>82+21+28+69+18=
=(</span><span>82+18)+(69+21)+28=
=100+90+28=218.</span>