Question

3) dada a expressao 2/3ab2 - ab2 + 1/3ab2 + 1/2ab2 pede-se a) a forma mais simples de escrever essa expressao b)o valor numerico quando a = -1 e b = -6 c) o valor numerico quando a = 0,4 e b = -0,2

Answer 1

Resposta:

$\frac{2}{3ab^{2}}-ab^{2} +\frac{1}{3ab^{2}}+\frac{1}{2ab^{2}}=\\ \\m.m.c=6ab^{2}\\ \\\frac{4ab^{2}-6a^{2}b^{4}+2+3}{6ab^{2}}=\\ \\\frac{4ab^{2}-6a^{2}b^{4}+5}{6ab^{2}} \\ \\a)~~\frac{4ab^{2}-6a^{2}b^{4}+5}{6ab^{2}}\\ \\ \\b)~~\frac{4.(-1).(-6)^{2}-\frac{4.(-1).(-6)^{4}+5}{6.(-1).(-6)^{2} }$

$\frac{4.(-1).36-6.1296+5}{-6+36}=\\ \\\frac{144-7776+5}{-6.36}\\ \\\frac{-7627}{216}=35,310$

$c)~~\frac{4.(0,4).(-0,2)^{2}-6.(0,4)^{2}.(-0,2)^{4}+5}{6.(0,4).(-0,2)^{2}}=\\  \\\frac{(1,6).(0,04)-6.(0,16).(0,0016)+5}{(2,4).0,04}=\\ \\\frac{0,064-0,001536+5}{0,096}=\\ \\\frac{5,062464}{0,096}=52,734$