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\(42-2\left(32-2^{x+1}\right)=10\)
\(\Leftrightarrow2\left(32-2^{x+1}\right)=42-10=32\)
\(\Leftrightarrow32-2^{x+1}=16\)
\(\Leftrightarrow2^{x+1}=32-16=16\)
\(\Leftrightarrow2^{x+1}=2^4\)
\(\Leftrightarrow x+1=4\)
\(\Rightarrow x=3\)
\(42-2\left(32-2^{x+1}\right)=10\)
\(\Leftrightarrow2^{x+1}=16\)
\(\Leftrightarrow2^{x+1}=2^4\)
=> x = 4
\(42-2.\left(32-2^{x+1}\right)=10\)
\(2.\left(32-2^{x+1}\right)=42-10\)
\(2.\left(32-2^{x+1}\right)=32\)
\(32-2^{x+1}=32:2\)
\(32-2^{x+1}=16\)
\(2^{x+1}=32-16\)
\(2^{x+1}=16\)
\(2^{x+1}=2^4\)
\(x+1=4\)
\(x=4-1\)
\(x=3\)
\(42-2\left(3x-2^{x+1}\right)=10\)
\(2\left(32-2^{x+1}\right)=32\)
\(32-2^{x+1}=16\)
\(2^{x+1}=16\)
\(2^{x+1}=2^4\)
\(\Rightarrow x+1=4\)
\(\Rightarrow x=3\)
Vậy x = 3
a, 3x - 5 = 16...............
=> 3x = 16 + 5 = 21..................
=> x = 21 : 3 = 7..........
\(b,42-2\left(32-2^{x+1}\right)=10\)
\(\Rightarrow2\left(32-2^{x+1}\right)=42-10=32\)
\(\Rightarrow32-2^{x+1}=32:2=16\)
\(\Rightarrow2^{x+1}=32-16=16=2^4\)
\(\Rightarrow x+1=4\)
\(\Rightarrow x=4-1=3\)
\(32-2\left(x+1\right)=42\)
\(\Rightarrow32-2x-1=42\)
\(\Rightarrow31-2x=42\)
\(\Rightarrow2x=31-42\)
\(\Rightarrow2x=-11\)
\(\Rightarrow x=\frac{-11}{2}\)
\(\Rightarrow x=-5,5\)
36.72-36.67=36.(72-67)=36.5=180 {296:[78-(579-30.7):9]}.18={296:[78-369:9]}.18=296:37.18=8.18=144 3x-5=16=3x-5=16+5.3x+5=21.x = 21:3.x = 7 vay x =7 phan kia minh ko bie,bn thong cam cho minh nha.minh can nhgieng cuu
\(36\cdot72-36\cdot67\)
\(=36\left(72-67\right)\)
\(=36\cdot5\)
\(=180\)
42 - 2 (32-2^x +1)=10
,<=>32=64-2.2^x+2
<=>2.2^x=34
<=>2^x=17
đề sai r