(161616/212121+2022/3033) nhân 7
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(161616\212121+2022\3033)*7
=(\(\frac{161616}{212121}+\frac{2022}{3033}\))*7
=(\(\frac{16}{21}+\frac{2}{3}\))*7
=\(\frac{30}{21}\)*7
=\(\frac{210}{21}\)
=10
\(\subset\frac{161616}{212121}+\frac{12036}{21063}\supset\times7\)
\(\subset\frac{161616:10101}{212121:10101}+\frac{12036:1003}{21063:1003}\supset\times7\)
\(\subset\frac{16}{21}+\frac{12}{21}\supset\times7\)
\(\frac{28}{21}\times7\)
\(\frac{196}{21}\)
\(\frac{28}{3}\)
tick đó nha
2:
a: Gọi d=ƯCLN(7n+4;9n+5)
=>63n+36-63n-35 chia hết cho d
=>1 chia hết cho d
=>d=1
=>PSTG
b: Gọi d=ƯCLN(n^3+3n;n^4+3n^2+1)
=>n^3+3n chia hết cho d và n^4+3n^2+1 chia hết cho d
=>n^4+3n^2-n^4-3n^2-1 chia hết cho d
=>-1 chia hết cho d
=>d=1
=>PSTG
c: Gọi d=ƯCLN(12n+1;30n+2)
=>60n+5-60n-4 chia hết cho d
=>1 chia hết cho d
=>d=1
=>PSTG
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`2^2 .2^3-(2022^0+19):2^2`
`=4.8-(1+19):4`
`=4.8-20:4`
`=32-5`
`=27`
\(2^2\cdot2^3-\left(2022^0+19\right):2^2=4\cdot8-\left(1+19\right):4=32-20:4=32-5=27\)
\(\left(\frac{161616}{212121}+\frac{2022}{3033}\right)\times7=\left(\frac{16.10101}{21.10101}+\frac{1011.2}{1011.3}\right)\times7=\left(\frac{16}{21}+\frac{2}{3}\right)\times7\)
\(=\frac{10}{7}\times7=10\)
Bài làm
\(\left(\frac{161616}{212121}+\frac{2022}{3033}\right)x7\)
= \(\left(\frac{16}{21}+\frac{2}{3}\right)x7\)
= \(\left(\frac{16}{21}+\frac{14}{21}\right)x7\)
= \(\frac{30}{21}x7\)
= \(\frac{30}{3}\)
= \(10\)
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