Привет!
122. y²-9 = (y-3)(y+3)
124. b²-36 = (b-6)(b+6)
126. 1-4c² = (1-2c)(1+2c)
128. m² - 16n² = (m-4n)(m+4n)
130. (2m-3n)(2m-3n)
131. (a-3)²
132. (m+5)²
133. (p-2q)²
134. (x+4y)²
135. (x-7)²
136. (6a-5b)(6a+5b)
137. (9c-4d)(9c+4d)
138. (2/3n-10m)(2/3+10m)
139. (2/7p-5/6q)(2/7p+5/6q)
140. (1/5xy-8/9x)(1/5xy+8/9x)
122.(3-y)(3+y)
124. (6-b)(6+b)
126. (2c-1)(2c+1)
128.(4n-m)(4n+m)
130. (3n-4m)(3n+4m)
Удачи