Раскройте скобки и подобные слагаемые: 1)4/7(-14a + 7x - 8/11(-22x + 11) 2) -2,5(10a - 1) + 3,8(5a - 3) 3)- 5/6(12b + 18) - 4/9(9b - 0,9)

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