Explicação passo-a-passo:
a)4(++5)+3(++5)=21
20+15=21
35=21
×=21-35
×=-14
d)2(++5)-3(5-1)=10
10-15+3=10
2=10
×=10-2
×=8
c)8(+-1)=8-4(2×-3)
-8=8-8×12
-8=12
×=12+8
×=20
[tex]a)4.(5) + 3.(5) = 20 + 15 = 35[/tex]
[tex]d)2(5) - 3.(5 - 1) = 10 - 5.4 = 10 - 20 = - 10[/tex]
[tex]c)8( + 1) = 8 - 4(2x - 3) = 8 = 8 - 8x + 12[/tex]
[tex] - 8x + 12 = 0 \\ - 8x = - 12 \: \: \times ( - 1) \\ 8x = 12 \\ x = \frac{12}{8} = \frac{3}{2} [/tex]
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Explicação passo-a-passo:
a)4(++5)+3(++5)=21
20+15=21
35=21
×=21-35
×=-14
d)2(++5)-3(5-1)=10
10-15+3=10
2=10
×=10-2
×=8
c)8(+-1)=8-4(2×-3)
-8=8-8×12
-8=12
×=12+8
×=20
Explicação passo-a-passo:
[tex]a)4.(5) + 3.(5) = 20 + 15 = 35[/tex]
[tex]d)2(5) - 3.(5 - 1) = 10 - 5.4 = 10 - 20 = - 10[/tex]
[tex]c)8( + 1) = 8 - 4(2x - 3) = 8 = 8 - 8x + 12[/tex]
[tex] - 8x + 12 = 0 \\ - 8x = - 12 \: \: \times ( - 1) \\ 8x = 12 \\ x = \frac{12}{8} = \frac{3}{2} [/tex]