Toán Lớp 6: 11+(15-2x)=0
-129-(35-x)=55
27-2.5 mũ x-2=5 mũ 8:5 mũ 6
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Toán Lớp 6: 11+(15-2x)=0
-129-(35-x)=55
27-2.5 mũ x-2=5 mũ 8:5 mũ 6
Comments ( 2 )
Giải đáp:
1. x = 13
2. x = 219
3. x = 0
Lời giải và giải thích chi tiết:
1.
11 + ( 15 – 2x ) = 0
15 – 2x = 0 – 11
15 – 2x = -11
2x = 15 – ( -11 )
2x = 26
x = 26 : 2
x = 13
Vậy x = 13
2.
-129 – ( 35 – x ) = 55
35 – x = -129 – 55
35 – x = -184
x = 35 – ( -184 )
x = 219
Vậy x = 219
3.
27 – 2 . $5^{x}$ – 2 = $5^{8}$ : $5^{6}$
27 – 2 . $5^{x}$ = $5^{8-6}$
27 – 2 . $5^{x}$ = $5^{2}$
27 – 2 . $5^{x}$ = 25
2 . $5^{x}$ = 27 – 25
2 . $5^{x}$ = 2
$5^{x}$ = 2 : 2
$5^{x}$ = 1
$5^{x}$ = $5^{0}$
x = 0
Vậy x = 0
#andy
\[\begin{array}{l}
a)11 + \left( {15 – 2x} \right) = 0\\
15 – 2x = – 11\\
2x = 26\\
x = 13\\
b) – 129 – \left( {35 – x} \right) = 55\\
35 – x = – 184\\
x = 219\\
c)27 – {2.5^x} – 2 = {5^8}:{5^6}\\
25 – {2.5^x} = {5^2}\\
25 – {4.5^x} = 25\\
{4.5^x} = 0\\
{5^x} = 0\\
x = 0
\end{array}\]