1) (x - 2,1 ) : 3 3/5 = 2 1/12
х-2.1=2 1/12*3 3/5
x-2.1=25/12*18/5
x-2.1=15/2
х-2.1=7.5
х=7.5+2.1
х=9.6
2) 4 5/7 • (x+0,28) = 1 4/7
х+0.28=1 4/7:4 5/7
x+0.28=11/7*7/33
x+0.28=1/3
x=1/3-0.28=1/3-7/25
x=25/75-21/25
x=4/25=0.16
1)395,85+127,2=523,05кг
2)4,895+3,15=8,045кг
3)127,09+234,91=362кг
1)45,345+23,3=68,645г
2)100,1+58,8=158,92г
3)567,43+265,7=833,13г
(5х-3)^2=(5х+2)^2
25х^2+30х-9=25х^2+20х-4
25х^2-25x^2+30x-20x=-4+9
10x=5
x=0,5
..............................
7х-6.75+38=47
7х-44.75=47
7х=47-44.75
7х=2.25
х=2.25:7
х=0.3