Ответ:

4/7(-14+7х)-8/11(-22х+11)= 4/7(-14)+4/7×7х-8/11×(-22х)-8/11×11=-8+4х+16х-8=20х-16

4/7×(-14)=4×(-14)/7=-56/7= -8

4/7×7х=4×7х/7=28х/7=4х

-8/11×(-22х)=-8×(-22х)/11=176х/11=16х

-8/11×11=-8×11/11=-88/11= -8

2)-2,5(10a — 1) + 3,8(5a — 3)=-25а+25+19а-11,4=-6а+11,4

3)- 5/6(12b + 18) — 4/9(9b — 0,9)=5/6 ( 12b + 18) — 4/9 (9b — 0,9) = 10b + 15 — 4b + 0,4 = 6b + 15,4