1) 4\7х(-5 5\6)-5\62х(-4 3\7) 2)(5х+8)-(8х+14)=9 3)2.7+3у=9(у-2.1

Question

1) 4\7х(-5 5\6)-5\62х(-4 3\7)
2)(5х+8)-(8х+14)=9
3)2.7+3у=9(у-2.1

Answer 1

1)=4/7х×(-35/6)-5/62х×(-31/7)=
=-10/3х+5/14х=-140/42х+15/42х=-125/42х=
=-2 41/42х

2)5х+8-8х-14=9
-3х-6=9
-3х=9+6
-3х=15
х=15÷(-3)
х=-5

3)2.7+3у=9у-18.9
3у-9у=-18.9-2.7
-6у=-21.6
у=-21.6÷(-6)
у=3.6