Решите уравнения . 1. 7m/5=2m/3 2. (x-3)²=x²=7-5x 3. -x²=82 4. (x-9)²-7(x-9)+12=0

Question

Решите уравнения . 1. 7m/5=2m/3 2. (x-3)²=x²=7-5x 3. -x²=82 4. (x-9)²-7(x-9)+12=0

Answer 1

1)7m/5=2m/3

21m=10m

21m-10m=0

11m=0

M=0

Answer 2

1)7m/5=2m/3

7m×5=2m×3

21m=10mm

21m-10m=0

11m=0

m=0