Пошаговое объяснение:
1)1,1 *(5х-9/28)=11/105
5x-9/28=11/105:1.1
5x-9/28=11/105*10/11
5x-9/28=2/21
5x=2/21+9/28
5x=8/84+27/84
5x=35/84
x=35/84:5=35/84*1/5
x=7/84=1/12
2)(2 29/30х+13/42)*0,125=17/56
2 29/30х+13/42=17/56:0.125
2 29/30х+13/42=17/56*8
2 29/30х+13/42=17/7
2 29/30x=17/7-13/42
2 29/30x=102/42-13/42
2 29/30x=89/42
x=89/42:2 29/30
x=89/42*30/89
x=30/42=5/7
Пошаговое объяснение:
1)1,1 *(5х-9/28)=11/105
5x-9/28=11/105:1.1
5x-9/28=11/105*10/11
5x-9/28=2/21
5x=2/21+9/28
5x=8/84+27/84
5x=35/84
x=35/84:5=35/84*1/5
x=7/84=1/12
2)(2 29/30х+13/42)*0,125=17/56
2 29/30х+13/42=17/56:0.125
2 29/30х+13/42=17/56*8
2 29/30х+13/42=17/7
2 29/30x=17/7-13/42
2 29/30x=102/42-13/42
2 29/30x=89/42
x=89/42:2 29/30
x=89/42*30/89
x=30/42=5/7