16 + 16 = ... = 16 x ... = 32
\(\dfrac{4}{3.5}\) + \(\dfrac{8}{5.9}\) + \(\dfrac{12}{9.15}\)+.......+
\(\dfrac{32}{x(x+16)}\) = \(\dfrac{16}{15}\)
\(\dfrac{32}{x(x+16)}\) = \(\dfrac{16}{15}\)
\(\dfrac{HeLp}{me}\) \(\dfrac{nguyễn}{đức}{Trí}\)
\(\dfrac{4}{3.5}+\dfrac{8}{5.9}+\dfrac{12}{9.15}+...+\dfrac{32}{x\left(x+16\right)}=\dfrac{16}{15}\)
\(2.\left(\dfrac{2}{3.5}+\dfrac{4}{5.9}+\dfrac{6}{9.15}+..+\dfrac{16}{X.\left(X+16\right)}\right)=\dfrac{16}{15}\)
\(\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{9}+\dfrac{1}{9}-\dfrac{1}{15}+...+\dfrac{1}{X}-\dfrac{1}{X+16}=\dfrac{8}{15}\)
\(\dfrac{1}{X+16}=\dfrac{1}{3}-\dfrac{8}{15}\)
\(\dfrac{1}{X+16}=\dfrac{-1}{5}\)
\(X+16=-5\)
\(X=-21\)
(x-32):16=48
và x-32:16=48
giúp tớ với
(x-32):16=48
=> x-32=48.16
=> x-32=768
=> x=768+32
=> x=800
x-32:16=48
=> x-2=48
=> x=48+2
=> x=50
( x - 32 ) : 16 = 48
x - 32 = 48 . 16
x - 32 = 768
x = 768 + 32= 800
x - 32 : 16= 48
x - 2 = 48
x = 48 + 2= 50
dễ thui màk:
( x - 32 ) : 16 = 48
x - 32 = 48 . 16
x - 32 = 768
x = 768 + 32
x = 800
x - 32 : 16 = 48
x - 2 = 48
x = 48 + 2
x = 50
\(x\) . \(\dfrac{8}{16}\) = \(\dfrac{32}{16}\)
\(x\cdot\dfrac{8}{16}=\dfrac{32}{16}\)
\(\Leftrightarrow x=\dfrac{32}{16}:\dfrac{8}{16}\)
\(\Leftrightarrow x=\dfrac{32}{16}\cdot\dfrac{16}{8}\)
\(\Leftrightarrow x=4\)
Ta có : \(x.\dfrac{8}{16}=\dfrac{32}{16}\)
\(\Leftrightarrow\dfrac{x}{2}=2\)
\(\Leftrightarrow x=4\)
Vậy ..
16 x 32 + 16 + 68
16 . 32 + 16 + 68 = 16. 33+ 68 = 528 + 68 = 596
_________________ tíc mình nha! ______________
16 x 32 + 16 + 68
Số cần tim là :
16 . 32 + 16 + 68 = 16. 33+ 68 = 528 + 68 = 596
Đáp số :...
câu trả lời của mình là
596
k mình nha ai k mình đầu tiên thì mình sẽ k lại người đó 3 lần
Tinh gia tri cua phan so: A= 2 x 3 + 2 x 4 x 8 + 4 x 8 x 16 + 8 x 16 x 32/ 3x 4 + 2 x 6 x 8 + 4 x 12 x 16 + 8 x 24 x 32
3+x/7+y=3/7 và x+y=20
A=2*4+2*4*8+4*8*16+8*16*32/3*4+2*6*8+4*12*16+8*24*32
1/1-x +1/1+x +2/1+x^2 +4/1+x^4 +8/1+x^8 +16/1+x^16 = 32/1-x^32 c/m
\(\dfrac{1}{1-x}+\dfrac{1}{1+x}+\dfrac{2}{1+x^2}+\dfrac{4}{1+x^4}+\dfrac{8}{1+x^8}+\dfrac{16}{1+x^{16}}\)
\(=\dfrac{1+x+1-x}{1-x^2}+\dfrac{2}{1+x^2}+\dfrac{4}{1+x^4}+\dfrac{8}{1+x^8}+\dfrac{16}{1+x^{16}}\)
\(=\dfrac{2+2x^2+2-2x^2}{1-x^4}+\dfrac{4}{1+x^4}+\dfrac{8}{1+x^8}+\dfrac{16}{1+x^{16}}\)
\(=\dfrac{4+4x^4+4-4x^4}{1-x^8}+\dfrac{8}{1+x^8}+\dfrac{16}{1+x^{16}}\)
\(=\dfrac{8+8x^8+8-8x^8}{1-x^{16}}+\dfrac{16}{1+x^{16}}\)
\(=\dfrac{16+16x^{16}+16-16x^{16}}{1-x^{32}}=\dfrac{32}{1-x^{32}}\)
a) 142+(118-x)=217
b) 818-(x-305)=712
c) x-32:16=48
d) (x-32) :16=48
a) 142+(118-x)=217
118-x =217-142
118-x =75
x =43
b) 818-(x-305)=712
x-305 =818-712
x-305 = 106
x = 411
c)x-32:16=48
x-2 =48
x =50
d)(x-32):16=48
x-32 =48.16
x-32 =768
x = 800
a ) x = 43
b ) x = 411
c ) x = 50
d ) x = 800
a)142+(118-x)=217
118-x =217-142
118-x =75
x=118-75
x=43
b)818-(x-305)=712
x-305 =818-712
x-305 =106
x=106+305
x=411
c)x-32:16=48
x-2 =48
x=48+2
x=50
d)(x-32):16=48
x-32 =48:16
x-32 =3
x=3+32
x=35
Tính nhẩm
8 x 2 = ...... 8 x 4 = ...... 8 x 7 = ...... 8 x 5 = ......
16 : 8 = ..... 32 : 8 = ..... 56 : 8 = ..... 40 : 8 = .....
16 : 2 = ..... 32 : 4 = ..... 56 : 7 = ..... 40 : 5 = .....
8 x 2 = 16 8 x 4 = 32 8 x 7 = 56 8 x 5 = 40
16 : 8 = 2 32 : 8 = 4 56 : 8 = 7 40 : 8 = 5
16 : 2 = 8 32 : 4 = 8 56 : 7 = 8 40 : 5 = 8
8 x 2 = 16 8 x 4 =32 8 x 7 =56 . 8 x 5 =40
16 : 8 = 2 32 : 8 =4 56 : 8 =7 40 : 8 =5
16 : 2 = 8 32 : 4 = 8 56 : 7 = 8 40 : 5 = 8
cái bài này bạn thuộc phép nhân chia của nó là làm dễ lắm nha