Question

Alguém que por favor me diz a resolução destas equações:

a) 2(x-3)=6
b) 3(a-2)=5a
c) 1-2(a-1)=a
d) 2-(x-3)=6x
e) 1-3(x-5)=x-1
f) 1-(2x-3)+(x+5)=2
g) -7(a-3)=a+5
h) 2+3(x-4)-2(x-5)=0.3

Answer 1

BOM DIA ^_^

$\bf \: 2(x - 2) = 6 \\ \bf \: 2x - 4 = 6 \\ \bf \: 2x = 6 + 4 \\ \bf \: 2x = 10 \\ \bf \: x = \frac{10}{2} = \pink{5}$

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$\bf \: 3(a - 2) = 5a \\ \bf \: 3a - 6 = 5a \\ \bf \: 3a - 5a = 6 \\ \bf - 2a = 6( - 1) \\ \bf \: 2a = - 6 \\ \bf \:$

$\bf \: a = \frac{ - 6}{2} = \pink{ - 3}$

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$\bf \: 1 - 2(a - 1) = a \\ \bf \: 1 \: - 2a + 2 = a \\ \bf \: - 2a - a = - 1 - 2 \\ \bf \: - 3a = - 3( - 1) \\ \bf \: 3a = 3$

$\bf \: a = \frac{3}{3} \\ \bf \: a = \pink{1}$

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$\bf \: 2 -1 (x - 3) = 6x \\ \bf \: 2 - x + 3 = 6x \\ \bf \: - x - 6x = - 2 \\ \bf \: - 7x = - 2( - 1) \\ \bf \: 7x = 2$

$\bf \: x = \frac{7}{2} \\ \bf \: x = \pink{3.5}$

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$\bf1 - 3(x - 5 )= x - 1 \\ \bf \:1 - 3x + 15 = x - 1 \\ \bf \: - 3x - x = - 1 + 15 - 1 \\ \bf \: - 4x = 13 ( - 1) \\ \bf \: 4x = 13$

$\bf \: x = \frac{13}{4} = \pink{3.25}$

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$\bf \: 1 - 1(2x - 3) + 1(x + 5) = 2 \\ \bf \: 1 - 2x + 3 + x + 5 = 2 \\ \bf \: - 2x + x = 2 - 5 - 3 - 1 \\ \bf - x = - 7( - 1) \\ \bf \: x = \pink{7}$

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$\bf \: - 7(a - 3) = a + 5 \\ \bf \: - 7a + 21 = a + 5 \\ \bf \: - 7a - a = 5 - 21 \\ \ \bf \: - 8 a= - 16( - 1) \\ \bf \: 8a = 16$

$\bf \: a = \frac{16}{8} = \pink{2}$

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$\bf \: 2 + 3(x - 4) - 2(x - 5) = 0.3 \\ \bf \: 2 + 3x - 12 - 2x + 1 = 0.3 \\ \bf \: 3x - 2x = 0.3 - 1 + 12 - 2 \\ \bf \: x = \pink{9.3}$

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