( a - 2 )^2 - ( a - 1 )( a + 3 ) = a^2 - 4a + 4 - ( a^2 + 3a - a - 3 ) = a^2 - 4a + 4 - a^2 - 2a + 3 = - 6a + 7
=======
( b + 4 )( b - 2 ) - ( b - 1 )^2 = b^2 - 2b + 4b - 8 - ( b^2 - 2b + 1 ) = b^2 + 2b - 8 - b^2 + 2b - 1 = 4b - 9
1.
А)
(3 1/4)^9 * (4/13)^11=(13/4)^9 * (4/13)^11= 1^9+11 = 1^20 = 1
Б)
2^9 * 5^14 : 50^7 = 2^9 * 5^14 : 2^7 * 5^14 = 2^2 = 4
2.
((x^4)^32 : x^43 / (x^5)^17) * x=201
(x^128 : x^43 / x^85) * x =201
(x^85/x^85) * x = 201
x = 201, при x не равном 0.
х²-8х+12=(х²-8х+16)-4=(х-4)²-4
8 × (1/4)² + 14 × 1/4 = 8 × 1/16 + 14/4 = 8/16 + 14/4 = 0,5 + 3,5 = 4