Wyrażenia Algebraiczne :
Zapisz w jak najprostszej postaci:
A ) (2a-b)² -2(a-b)(2a+b)
B) 5(s+3t)(3t-s) - (s+2t)²
C) (z+0,3)² + (z+0,2)(0,2-z)
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A ) (2a-b)²-2(a-b)(2a+b) = 4a²-4ab-2(2a²+ab-2ab-b²) = 4a²-4ab-4a²-2ab+4ab+2b² = 2b²-2ab
B) 5(s+3t)(3t-s)-(s+2t)² = 5(3st-s²+9t²-3st)-(s²+4st+4t²) = 15st-5s²+45t²-15st-s²-4st-4t² = -6s²+41t²-4st
C) (z+0,3)²+(z+0,2)(0,2-z) = z²+0,6z+0,09+0,2z-z²+0,04-0,2z = 0,6z+0,13