tính nhanh: 1/2x3/4+1/2x1/4+1/2
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\(x\) \(\times\) \(\dfrac{1}{2}\) = 1 - \(\dfrac{1}{3}\)
\(x\) \(\times\)\(\dfrac{1}{2}\) = \(\dfrac{2}{3}\)
\(x\) = \(\dfrac{2}{3}\) : \(\dfrac{1}{2}\)
\(x\) = \(\dfrac{4}{3}\)
A = \(\dfrac{1}{1\times2}\) + \(\dfrac{1}{2\times3}\) + \(\dfrac{1}{3\times4}\)+...+ \(\dfrac{1}{2021\times2022}\)
A = \(\dfrac{1}{1}\) - \(\dfrac{1}{2}\) + \(\dfrac{1}{2}\) - \(\dfrac{1}{3}\) + \(\dfrac{1}{3}\) - \(\dfrac{1}{4}\)+...+ \(\dfrac{1}{2021}\) - \(\dfrac{1}{2022}\)
A = 1 - \(\dfrac{1}{2022}\)
A = \(\dfrac{2021}{2022}\)
`A(x)+B(x)=`\((2x^3+3x^2-2x+1)+(2x^3+5x-4)\)
`=2x^3+3x^2-2x+1+2x^3+5x-4`
`= (2x^3+2x^3)+3x^2+(-2x+5x)+(1-4)`
`= 4x^3+3x^2+3x-3`
Tính
a ) 1/2 x 1/4 x 1/6
= 1/8 x 1/6
= 1/48
b ) 1/2 x 1/4 : 1/6
= 1/8:1/6
3/4
c ) 1/2 : 1/4 x 1/6
= 2 x 1/6
= 1/3
tk mk nha ( nếu đúng )
hihi mơn nha !!!!!!!!!
Tính
a ) 5/2 x 1/3 + 1/4
= 5/5+1/4
=13/12
b)5/2 + 1/3 x 1/4
= 5/2 + 1/12
= 31/12
c ) 5/2 -1/3 :1/4
= 5/2 - 4/3
= 7/6
tk mk nha ( nếu đúng )
hihi mơn nha !!!!!!!!!!
a. = (5/2x2/3) +1/4
= 5/3+1/4= 23/12
b. = 5/2+( 1/3x1/4)
= 5/2+1/12
=31/12
c. =5/2-( 1/3:1/4)
= 5/2-4/3
= 7/6
2:
=>x^3-1-2x^3-4x^6+4x^6+4x=6
=>-x^3+4x-7=0
=>x=-2,59
4: =>8x-24x^2+2-6x+24x^2-60x-4x+10=-50
=>-62x+12=-50
=>x=1
A = 1 x 2 + 2 x 3 + 3 x 4 + 4 x 5 + ... + 99 x 100
A = 2 + 6 + 12 + 20 + ... 9900
A = [2+9900] rồi bn nhân tổng số từ số 2 - 9900
\(3A=1.2.3+2.3.\left(4-1\right)+...+99.100.\left(101-98\right)\)
\(3A=1.2.3+2.3.4-1.2.3+...+99.100.101-98.99.100\)
\(3A=99.100.101\)
\(\Rightarrow A=\frac{99.100.101}{3}\)
Địt mẹ mày
\(\dfrac{1}{2}\times\dfrac{3}{4}+\dfrac{1}{2}\times\dfrac{1}{4}+\dfrac{1}{2}\)
\(=\dfrac{1}{2}\times\left(\dfrac{3}{4}+\dfrac{1}{2}\right)\times\dfrac{1}{4}\)
\(=\dfrac{1}{2}\times\dfrac{5}{4}\times\dfrac{1}{4}\)
\(=\dfrac{5}{32}\)