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Đáp án:
Giải thích các bước giải:
1) x + 7 = 17
x = 17-7
x = 10
2) 21 – x = 5
x = 21-5
x =16
3) 7 + 2 x =27
9 x =27
x = 27:9
x = 3
4) 16 + 3 x = 36
19 x = 36
x = 36:19
x = De SAI
Đáp án:
12) x=11
Giải thích các bước giải:
\(\begin{array}{l}
1)x + 7 = 17\\
\to x = 10\\
4)16 + 3x = 36\\
\to 3x = 20\\
\to x = \dfrac{{20}}{3}\\
7)10 + 2x = \dfrac{{{4^5}}}{{{4^3}}}\\
\to 10 + 2x = {4^2}\\
\to 10 + 2x = 16\\
\to 2x = 6\\
\to x = 3\\
10)185 – 3x + 15 = 5.16\\
\to 200 – 3x = 80\\
\to 3x = 120\\
\to x = 40\\
13)7x – 24 = \dfrac{{{5^6}}}{{{5^4}}}\\
\to 7x – 24 = {5^2}\\
\to 7x – 24 = 25\\
\to 7x = 49\\
\to x = 7\\
16){3.2^x} = 48\\
\to {2^x} = 16\\
\to {2^x} = {2^4}\\
\to x = 4\\
2)21 – x = 5\\
\to x = 16\\
5)3x – 15 = 75\\
\to 3x = 90\\
\to x = 30\\
8)160 – x – 2 = \dfrac{{{8^5}}}{{{8^3}}}\\
\to 158 – x = {8^2}\\
\to 158 – x = 64\\
\to x = 94\\
11)23x – 21 = \dfrac{{{5^6}}}{{{5^4}}}\\
\to 23x – 21 = {5^2}\\
\to 23x – 21 = 25\\
\to 23x = 46\\
\to x = 2\\
14)x – 20 = 40.5\\
\to x – 20 = 200\\
\to x = 220\\
3)7 + 2x = 27\\
\to 2x = 20\\
\to x = 10\\
6)72 – 35 – x = 27\\
\to 37 – x = 27\\
\to x = 10\\
9)2x – 6 – 12 = 10\\
\to 2x – 18 = 10\\
\to 2x = 28\\
\to x = 14\\
12)x + 19 = 30\\
\to x = 11
\end{array}\)