giúp mk câu 32
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1> Theo de bai, ta co \(452-32⋮a\)
\(\Rightarrow420⋮a\)(1)
\(321-21⋮3\)
\(\Rightarrow300⋮a\)(2)
Tu (1)(2) \(\Rightarrow a\in U\left(420,300\right)\)sao cho\(a\in N\)
\(a=60\)
2> Ta co \(\left(3^{15}\cdot4+5\cdot3^{15}\right)\div3^{15}\)
\(\Rightarrow3^{15}\cdot\left(4+5\right)\div3^{15}\)
\(=9\)
32.62+32.37+32
=32.62+32.37+32.1
=32.(62+37+1)
=3200
tick mk nha
hok tốt
@Lâm
\(\frac{x}{3}=\frac{y}{2}\Rightarrow\frac{2x}{2.3}=\frac{5y}{5.2}=\frac{2x}{6}=\frac{5y}{10}\)
Áp dụng tính chất của dãy tỉ số bằng nhau ta có :
\(\frac{2x}{6}=\frac{5y}{10}=\frac{2x+5y}{6+10}\)\(=\frac{32}{16}=2\)
\(\frac{2x}{6}=2\Rightarrow2x=12\Rightarrow x=6\)
\(\frac{5y}{10}=2\Rightarrow5y=20\Rightarrow y=4\)
Vậy ..
ta có: x/3 =y/2 => 2x/6 = 5y/10
áp dụng tính chất dãy tỉ số bằng nhau ta có:
2x/6 = 5y/10 = 2x + 5y/ 6 + 10 = 32/16 = 2
=> x = 3 . 2 = 6 ; y = 2 . 2 = 4
vậy ( x , y ) = ( 6 ; 4 )
\(3^2\left(x+4\right)-5^2=5\cdot2^2\\ 9\left(x+4\right)-25=20\\ 9\left(x+4\right)=20+25\\ 9\left(x+4\right)=45\\ x+4=45:9\\ x+4=5\\ x=5-4\\ x=1\)
\(\left(3x-1\right)^5=32\\ \Rightarrow\left(3x-1\right)^5=2^5\\ \Rightarrow3x-1=2\\ \Rightarrow x=1\)
32 D
I
1 looked for a job for some months
2 was checked by Mr Brown yesterday
3 the weather was bad, we couldn't go out
4 If it weren't raining heavily, we wouldn't cancel
III
1 It was such a boring film that we left before the end
2 I haven't seen her since 2 years ago
3 They will be punished by the teacher for being so lazy
4 They got up early so that they wouldn't be late for the meeting
Chọn B
Đáp án B nha!