В метрах и дециметрах 81 дм 130 СМ

2.7(х+2)-3.2(2х+3)=20.5
2.7х+5.4-6.4х+9.6=20.5
2.7х-6.4х=20.5-5.4-9.6
-3.7=5.5
х=5.5/(-3.7)
х=-1.48

Ответ на этот вопрос: -20,16

9...... 7..........4...........5........8.........6.............3..............63............54
63.....49........28.......35.......56.......42...........21...........441...........378
54......42........24.........30......48.......36.........18.............378.........324

А)
изза 2х5(10)......5х4(20)......5х8(40).......10.....20...30.....40......50