Trzy przyklady z matematyki :)
1. (¼a+8)²=
2.(0.9+10y)²=
3.(7-2k)(7+2k)=
Zastosować odpowiednie wzory do tego :)
Dam naj.
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1. (¼a+8)²= (1/4a)² + 2*1/4a * 8 + 8² = 1/16a² + 4a + 64
2.(0.9+10y)²= (0,9)²+ 2*0,9 * 10y + (10y)² = 0,81 + 18y +100y²
3.(7-2k)(7+2k)= 7² - (2k)² = 49 - 4k²
(a+b)²=a²+2ab+b²
(a-b)(a+b) = a² -b²