(40-4х)/2=16 (63-9х)/3=15 4(х-3)=12 5(х+5)=45 3(х-7)=9 - вопрос №609577440421663931543125545379 от fifi17 28.09.2021 22:05

Question

Математика: (40-4х)/2=16 (63-9х)/3=15 4(х-3)=12 5(х+5)=45 3(х-7)=9

fifi17 · Answer

1) (40-4х):2=16
40-4х=16*2
40-4х=32
-4х=32-40
-4х= -8
х=2

2) (63-9х):3=15
63-9х=15*3
63-9х=45
-9х=45-63
-9х= -18
х=2

3) 4(х-3)=12
4х-12=12
4х=12+12
4х=24
х=6

4) 5(х+5)=45
5х+15=45
5х=45-15
5х=30
х=6

5) 3(х-7)=9
3х-21=9
3х=9+21
3х=30
х=10