Формула: (a+b)² = (a²+2ab+b²)

№521.

(0,6 + 2x)² = (0,36+2,4x+4x²).

№522.

№523.

(4a+)² = (16a²+2ab+)

№524

(0,1m + 5n)² = (0,01m²+mn+25n²)

№525

(12a-0,3c)² = (144a²-7,2ac+0,9c²)

^ - степень

521:

(0.6+2x)^2= (2x)^2+2*2*0.6x+0.6^2=4x^2+2.4x+0.36

522:

(x/3-3y)^2=(x/3)^2+2*(-3)*x/3+(1\3)^2=x^2/9-2x+1/9

523:

(4a+b/8)^2= (4a)^2+2*4*x/8+(b/8)^2=16a^2+x+b^2/64

524:

(0.1m+5n)^2=(0.1x)^2+2*0.1m*5n+(5n)^2=0.01x^2+mn+25x^2

525:

(12a-0.3c)^2=(12a)^2+2*12a*(0.3c)+(-0.3c)^2=144a^2-7.2ac+0.09c^2