Question

помогите пожалуйста это срочно !!!!​

Answer 1

Ответ:

1. $49m^{2} -14m$

2. $9m^{2} +16n^{2}$

3. $100a-25a^{2}$

4. $10xy-25$

5. $12c$

6. $-32-8a^{2}$

Объяснение:

1. $(7m-1)^{2} -1=49m^{2} -14m+1-1=49m^{2} -14m$

2. $(3m+4n)^{2} -24mn = 9m^{2} +24mn+16n^{2} -24mn = 9m^{2} +16n^{2}$

3. $100-(10-5a)^{2} = 100-(100-100a+25a^{2} ) = 100-100+100a-25a^{2} = 100a-25a^{2}$

4. $x^{2} y^{2} -(xy-5)^{2} =x^{2} y^{2} -(x^{2} y^{2} -10xy+25)=x^{2} y^{2} -x^{2} y^{2} +10xy-25 = 10xy-25$

5. $c^{2} +36-(c-6)^{2} = c^{2} +36-(c^{2} -12c+36)=c^{2} +36-c^{2} +12c-36 = 12c$

6. $a^{4} -16-(a^{2} +4)^{2} = a^{4} -16-(a^{4} +8a^{2} +16) =a^{4} -16-a^{4} -8a^{2} -16=-32-8a^{2}$