1)120: (25-х)=10 2)240: (70-х)=10 3)(х•16)•8=80 4)(180: х)•4=24

120:(25-х)=10;
25-х=120:10;
25-х=12;
х=25-12;
х=13;
ответ:13
240:(70-х)=10;
70-х=240:10;
70-х=24;
х=70-24;
х=46;
ответ:46

(180:х)*4=24;
180:х=24:4;
180:х=6;
х=180:6;
х=30;
ответ:30