Question

Uprość :

1. 2(a-b)²-2(a+b)²+4(a+b)(a-b)

2. (m+1)²-(2m-2)²+(2m+3)²-(4m-4)²

3. 2(3-x)(1+x)-(1-2x)²+(-2-x)²

4. 9²-(1-x)(2+x)-3(5-x)²

Uprość i oblicz :

5. (a+0,2)²-(a-0,2)² a=50

6. 16(0,25+0,5b)(0,25-0,5b)-4(2b-1)²-16b b=√2

Answer 1

1.2(a-b)²-2(a+b)²+4(a+b)(a-b) = 2(a²-2ab+2b²)-2(a²+2ab+b²)+4(a²-b²) = 2a²-4ab-2b²+4a²=4a²-4b²=4a²-8ab-4b²

 

Answer 2