Resposta:
a) 2(x - 5)-3(2-x) =
2.x - 2.5 - 3.2 -3.-x =
\ / \ / \ / \ /
2x - 10 - 6 + 3x = isole x
2x +3x = 10 + 6
5x = 16
x = 16/5
b) 7(2-x)+X-7
7.2 + 7.-x +x -7 =
\ / \ / | |
14 - 7x +x -7 = isole x
-7x +x = -14 +7
-6x = -7
x = -7/-6
x = +7/6
c) x(9-2) + 2(x-1)
x.9 + x.-1 + 2.x + 1.-1 =
9x -x +2x -1 = isole x
9x -x +2x = 1
\ / | |
8x +2x = 1
10x = 1
x = 1/10
d) -5(2ab² - 3a +5b) +4ab²+10a =
-5.2ab² -5.-3a -5.5b +4ab² +10a =
\ / \ / \ /
-10ab² +15a -25b +4ab² +10a =
colocando ab², a e b na prdem
-10ab² +4ab² +15a +10a -25b =
\ / \ /
-6ab² +25a -25b
Explicação passo a passo:
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Resposta:
a) 2(x - 5)-3(2-x) =
2.x - 2.5 - 3.2 -3.-x =
\ / \ / \ / \ /
2x - 10 - 6 + 3x = isole x
2x +3x = 10 + 6
5x = 16
x = 16/5
b) 7(2-x)+X-7
7.2 + 7.-x +x -7 =
\ / \ / | |
14 - 7x +x -7 = isole x
-7x +x = -14 +7
-6x = -7
x = -7/-6
x = +7/6
c) x(9-2) + 2(x-1)
x.9 + x.-1 + 2.x + 1.-1 =
\ / \ / \ / \ /
9x -x +2x -1 = isole x
9x -x +2x = 1
\ / | |
8x +2x = 1
10x = 1
x = 1/10
d) -5(2ab² - 3a +5b) +4ab²+10a =
-5.2ab² -5.-3a -5.5b +4ab² +10a =
\ / \ / \ /
-10ab² +15a -25b +4ab² +10a =
colocando ab², a e b na prdem
-10ab² +4ab² +15a +10a -25b =
\ / \ /
-6ab² +25a -25b
Explicação passo a passo: