<span><span>7*(3+к)=33 +5к
21+7к=33+5к
7к-5к=33-21
2к=12
<span>к=6</span></span></span>
1) 121/10 : 11/3 = 363/10 = 3,3
2) 3,3 - 1,2 = 2,1
3) 2,1 х 8/7 = 0,3 х 8 = 2,4
<span>[1], [2, 3, 5, 7], [4, 9], [6, 8, 10].</span>
24*4=24+24+24+24; k*8=k+k+k+k+k+k+k+k; (x+y)*4= х+y+x+y+x+y+x+y; (2а-b)*5= 2a-b +2a-b+2a-b+2a-b+2a-b