lam on giai ho minh bai minh moi dang di
1/4+1/28+1/70+1/130+1/208 dang gi vay mn lam thanh bai giai ho minh nha
\(\frac{1}{4}+\frac{1}{28}+\frac{1}{70}+\frac{1}{130}+\frac{1}{208}\)
\(=\frac{1}{1\times4}+\frac{1}{4\times7}+\frac{1}{7\times10}+\frac{1}{10\times13}+\frac{1}{13\times16}\)
\(=1-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+\frac{1}{7}-\frac{1}{10}+\frac{1}{10}-\frac{1}{13}+\frac{1}{13}-\frac{1}{16}\)
\(=1-\frac{1}{16}=\frac{15}{16}\)
Chúc bạn học tốt ^^
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cho phan so 19/44,can phai bot ca TS va MS di bao nhieude gia tri cua PS moi bang 2/7?
giup minh lam bai nay voi minh dang can gap!
Hiệu của TS và MS là :
44-19=25
TS mới là :
25:(7-2)x2=10
Số bớt đi là :
19-10=9
Đ/S:9
ban giup toi giai bai . mot cua hang ban 356,5m vai gom hai loai : vai hoa va vai trang. Biet so vai hoa bang 78,25% so vai trang . tinh so met vai moi loai
bai giai rat de hay lam gium minh di
Bai 26:dien tich mot rung ngap man la 12ha,trong do 7/10 la dien tich trong tram.hoi dien tich con lai bao nhieu met vuong ?
Bai 27: ba Tu co mot khu dat hinh vuong cach 13m.Ba rao xung quanh bang 5 duong kem gai.neu ba mua mot cuon kem gai dai 400m thi con thua bao nhieu met,biet rang ba chua 2m lam cong?
Bai 28:mot mieng bia hinh chu nhat.Neu chieu dai cat di 1/5 thi dien tinh mieng bia giam 240m2.hoi dien tich ban dau la bao nhieu m2
cam on moi nguoi nha con m2 la met vuong do moi nguoi giup minh nha minh can gap lam chieu nay minh di hoc roi moi nguoi giai nhanh giup minh
Tinh nhanh
2,5 : 0,25 :0,5
Ban nao giai giup minh voi minh dang can gap minh se tich cho ban nao tra loi nhanh nhat dung nhat nen giai ho minh di nhe can gap lam nhe cac ban
Tính nhanh :
3,5 : 0,25 : 0,5
= 14 : 0,5
= 28
k cho mik nha
2,5 : 0,25 : 0,5
= 10 : 0,5
= 20
mik ghi lộn đề nha
sorry
ket ban va giai ho minh bai toan lop 5 nha lam on can gap mai thi
Bai 26:dien tich mot rung ngap man la 12ha,trong do 7/10 la dien tich trong tram.hoi dien tich con lai bao nhieu met vuong ?
Bai 27: ba Tu co mot khu dat hinh vuong cach 13m.Ba rao xung quanh bang 5 duong kem gai.neu ba mua mot cuon kem gai dai 400m thi con thua bao nhieu met,biet rang ba chua 2m lam cong?
Bai 28:mot mieng bia hinh chu nhat.Neu chieu dai cat di 1/5 thi dien tinh mieng bia giam 240m2.hoi dien tich ban dau la bao nhieu m2
cam on moi nguoi nha con m2 la met vuong do moi nguoi giup minh nha minh can gap lam chieu nay minh di hoc roi moi nguoi giai nhanh giup minh
diện tích trồng Tràm là
12 x 7/10 = 8,4 ha
diện tích còn lại là
12 - 8,4 = 3,6ha
đổi 3,6 ha = 36000 m2
hai bài sau bạn viết có dấu đi mình mới hiểu được
diện tích trồng tràm là
12x7:10=8,4ha
diện tích còn lại là
12-8,4=3,6ha
3,6ha=36000m2
Đ/s:36000m2
hien nay anh va em 30 tuoi. khi tuoi em bang tuoi anh hien nay thi tuoi anh gap 3 lan tuoi em hien nay. tim so tuoi moi nguoi hien nay
giai giup minh bai nay nhe minh dang can gap trong toi nay ai lam minh se co mot tich
gọi tuổi anh là A
gọi tuổi e là B
khi e bằng tuổi a hiện nay B + ( A - B )
tuổi a = 3B
=> (3B - A ) = A - B
=> 3B - a = A - B
=> 4B = 2A
=> 2B =A
mak A + B = 30
=> A =20
B = 10
Đ/S : tuổi anh 20 tuổi
tuổi em = 10 tuổi
a) x^2+4x+4=6*(x+2)
b)27^3-72x=0
giup mik nha moi nguoi
bai nay da lam minh nat oc bua gio roi
lam d hay sai minh cung tich dung cho nguoi giai dau tien
cam on moi nguoi
Nếu là bài tìm x thì mình xin làm như sau
a) Ta có: \(x^2+4x+4=6\left(x+2\right)\)
\(\Rightarrow\left(x+2\right)^2=6\left(x+2\right)\)
\(\Rightarrow\left(x+2\right)^2-6\left(x+2\right)=0\)
\(\Rightarrow\left(x+2\right)\left(x+2-6\right)=0\)
\(\Rightarrow\left(x+2\right)\left(x-4\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x+2=0\\x-4=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=-2\\x=4\end{matrix}\right.\)
Vậy: \(x\in\left\{-2;4\right\}\)
b) ta có: \(27^3-72x=0\)
\(\Rightarrow19683-72x=0\)
hay \(72x=19683\)
hay x=\(\frac{19683}{72}=273,375\)
Vậy: \(x=273,375\)
Đây là bài tìm x hả bạn