1) 9,15+(x-8,5)=21,77
x-8,5=21,77-9,15
x-8,15=12,62
x=12,62+8,15
x=20,77
1)ответ:х=20,77
2)(50-x)+7,16=8,132
50-x=8,132-7,16
50-x=0,972
x=50-0,972
x=49,028
2)ответ:x-49,028
:3
1) 9,15+(x-8,5)=21,77
x-8,5=21,77-9,15
x-8,15=12,62
x=12,62+8,15
x=20,77
1)ответ:х=20,77
2)(50-x)+7,16=8,132
50-x=8,132-7,16
50-x=0,972
x=50-0,972
x=49,028
2)ответ:x-49,028
:3