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1½(½-6)= -4,5*7,5-7-2,25+9=-34
(3a-2b)(3a+2b)-2(a+b)²-3a(a-2b) = 9a²-4b²-2(a²+2ab+b²)-3a²+6ab = 9a²-4b²-2a²-4ab-2b²-3a²+6ab= 4a²-6b²+2ab
4*(½)²-6*3²+2*½*3=4*¼-6*9+3=1-54+3=-53+3=-50
9a ² + 6ab-6ab - 4b ² - 2a ² + 2 b ² - 3a ²+ 6ab=
=4a ² + 6ab - 2b ²=
4* ½ ² + 6 * ½ * 3- 2*3 ²=
= 1+9-18=10-18=-8