PROSZĘ O POMOC... Z GÓRY DZIĘKUJĘ
Mając dane wyrażenia; A = 1/2a^ - 3ab + b - 4
B = 2a + 5ab - 4b
C = 2,5a^ - 4a - 5b
oblicz;
a) A - [B+C]
b) B + [C-A]
c) [A-B] + C
d) [A+B] - C
e) C - [A-B]
1/2 TO UŁAMEK, A ^ OZNACZA DO POTĘGI DRUGIEJ
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a) 1/2a^-3ab+b-4 - [2a+5ab-4b+2,5a^-4a-5b]= 1/2a^-3ab+b-4 - [2,5a^-2a+5ab-9b]= 0,5a^-3ab+b-4-2,5a^+2a-5ab+9b= -2a^-8ab+10b-4+2a
b) 2a + 5ab - 4b + [2,5a^ - 4a - 5b - (1/2a^ - 3ab + b - 4)]= 2a + 5ab - 4b +[2,5a^ - 4a - 5b - 0,5a^ +3ab -b +4]= 2a+5ab-4b +2a^-4a-6b+3ab+4= 2a^-2a+8ab-10b +4
c) [1/2a^ - 3ab + b - 4 - (2a + 5ab - 4b)] + 2,5a^ - 4a - 5b = 0,5a^-3ab+b-4-2a-5ab+4b+2,5a^-4a-5b= 3a^-8ab-4-6a
d) [1/2a^ - 3ab + b - 4 +2a + 5ab - 4b]- ( 2,5a^ - 4a - 5b)= 0,5a^+2ab-3b-4+2a - 2,5a^+4a+5b= -2a^+2ab+2b-4+6a
e) 2,5a^ - 4a - 5b - [1/2a^ - 3ab + b - 4 -(2a + 5ab - 4b)]= 2,5a^-4a-5b - [0,5a^-3ab+b-4 - 2a-5ab+4b]= 2,5a^-4a-5b- [0,5a^-8ab+5b-4-2a]= 2,5a^-4a-5b - 0,5a^+8ab-5b+4+2a= 2a^ -2a -10b+8ab+4