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Phạm Quang Lộc
Giới thiệu về bản thân
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Bài giải
Số dê bằng số phần tổng số trâu, bò và dê là:
\(\dfrac{1}{8+1}=\dfrac{1}{9}\)
Số bò chiếm:
\(1-\dfrac{1}{9}-\dfrac{3}{5}=\dfrac{13}{45}\) (số con)
Nông trại đó có là:
\(52:\dfrac{13}{45}=180\)(con)
Đáp số: \(180\) con
\(B=1-2-3+4+5-6-7+8-...-99+100\)
\(B=\left(1-2-3+4\right)+\left(5-6-7+8\right)-...+\left(97-98-99+100\right)\)
\(B=0+0-...-0\)
\(B=0\)
Chọn D. Rooms
Vì chữ cái ''s'' trong từ rooms đọc là /z/ còn lại là /s/
1. faster
2. harder
3. clearer
4. better
5. simpler
6. later
7. ealier
Câu trên thiếu tobe rồi ạ
`x/(x+1)=1/(1xx2)+1/(2xx3)+1/(3xx4)+...+1/(31xx32)`
`=>x/(x+1)=1-1/2+1/2-1/3+1/3-1/4+...+1/31-1/32`
`=>x/(x+1)=1-1/32`
`=>x/(x+1)=31/32`
`=>32x=31(x+1)`
`=>32x=31x+31`
`=>32x-31x=31`
`=>x=31`
`5. 4/15`
`=(5.4)/15`
`=20/15`
`=4/3`
`(4x+1)(-x-9)=0`
TH1: `4x+1=0`
`=>4x=-1`
`=>x=-1/4`
TH2: `-x-9=0`
`=>-x=9`
`=>x=-9`
Vậy `x\in{-1/4;-9}`
`4/15+35/99+11/15-2/7+64/99-5/7`
`=(4/15+11/15)+(35/99+64/99)-(2/7+5/7)`
`=15/15+99/99-7/7`
`=1+1-1`
`=2-1`
`=1`