3 21/25+1 2/5=4+21/25+10/25=4 31/25=5 6/25
1) 3400:20=170
2) 170*100=17000
(16,3-100х)/2==5; 16,3-100х=10; 100х=16,3-10; 100х=6,3; х=6,3/100; х=0,063; 4)100х+4,6=15; 100х=15-4,6; 100х=10,4; х=10,4/100; х=0,104
=(а^2-1)(а^2+1)-10=а^4-1-10=
а^4-11=(1/3)^4-11=1/81-11=(1-11•81)/81=
-890/81=-10цел .80/81
(наверно а=1/3)