Ответ:
1.
2×2+3×(-1)=1
2.
а)
5х+4,5=3х+2,5
5х-3х+4,5-2,5=0
2х+2=0
2х=2
х=1
б)
2х+(6х+5)=45
2х+6х+5=45
8х+5-45=0
8х-40=0
х=5
3.....
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Answers & Comments
Ответ:
1.
2×2+3×(-1)=1
2.
а)
5х+4,5=3х+2,5
5х-3х+4,5-2,5=0
2х+2=0
2х=2
х=1
б)
2х+(6х+5)=45
2х+6х+5=45
8х+5-45=0
8х-40=0
х=5
3.....