4. Решите уравнения:
a) 7x + 9x = 64;
в) 18y – 9y - 23 = 31;
б) 8*x*125 = 8000;
г) (х - 6)(10- х) = 0.
a) 7x + 9x = 64;
в) 18y – 9y - 23 = 31;
б) 8*x*125 = 8000;
г) (х - 6)(10- х) = 0.
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Ответ:
1)7х+9х=64
16х=64
Х=4
2) 18у-9у-23=31
9у-23=31
9у=31+23
9у=54
У=6
3)8*х*125=8000
1000х=8000
Х=8
4)(х-6)(10-х)=0
Х-6=0
10-х=0
Х1=6
Х2=10