\(4,34\times x+6,76\times x=4,995\)
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\(4,34.x+6,76.x=4,995\)
\(\Leftrightarrow\left(4,34+6,76\right).x=4,995\)
\(\Leftrightarrow11,1.x=4,995\)
\(\Leftrightarrow x=4,995:11,1\)
\(\Leftrightarrow x=0,45\)
Vậy x = 0,45
_Chúc bạn học tốt_
4,34 x X + 6,76 x X =4,995
X x (4,34 + 6,76) =4,995
X x 11,1 =4,995
X =4,995 : 11,1
X = 0,45
a) 4,34 x X + 6,76 x X = 4,995
( 4,34 + 6,76 ) x X = 4,995
11,1 x X = 4,995
X = 4,995 : 11,1 = 0,45.
b) 15,6 : X - 4,3 = 0,9
15,6 : X = 0,9 + 4,3
15,6 : X = 5,2
X = 15,6 : 5,2
X = 3
k nha!
a) \(6,5+1,2+3,5-5,2+6,5-4,8\)
\(=6,5+1,2+3,5+6,5-5,2-4,8\)
\(=\left(6,5+3,5+6,5\right)+1,2-\left(5,2+4,8\right)\)
\(=16,5+1,2-10\)
\(=17,7-10\)
\(=7,7.\)
b) \(\left(-4,3.1,1+1,1.4,5\right):\left(-0,5:0,05+10,01\right)\)
\(=\left\{1,1.\left[\left(-4,3\right)+4,5\right]\right\}:\left[\left(-10\right)+10,01\right]\)
\(=\left(1,1.0,2\right):0,01\)
\(=0,22:0,01\)
\(=22.\)
c) \(\left(6,7+5,66-3,7+4,34\right).\left(-76,6.1,2+7,66.12\right)\)
\(=\left[\left(5,66+4,34\right)+\left(6,7-3,7\right)\right].\left[7,66.\left(-10\right).1,2+7,66.12\right]\)
\(=\left[10+3\right].\left[7,66.\left(-12\right)+7,66.12\right]\)
\(=13.\left\{7,66.\left[\left(-12\right)+12\right]\right\}\)
\(=13.0\)
\(=0.\)
Chúc bạn học tốt!
a: \(=12x^2-9x-12x^2-10x+6x+5=-13x+5\)
b: \(=3x\left(x^2-2x+1\right)-2x\left(x^2-9\right)+4x^2-16x\)
\(=3x^3-6x^2+3x-2x^3+18x+4x^2-16x\)
\(=x^3-2x^2+3x\)
c: \(=x^3-3x^2+3x-1+x^3+8+3\left(x^2-16\right)\)
\(=2x^3-3x^2+3x+7+3x^2-48=2x^3+3x-41\)
d: \(=\left(x^3+1\right)\left(x^3-1\right)=x^6-1\)
\(x\times x^2\times x^3\times x^4\times...\times x^{100}=x^{1+2+3+4+...+100}=x^{101\times500}=x^{5050}\)
a) -12.(x-5)+7.(3.x)=5
<=> -12x+60+21+7x=5
<=>-5x+81=5
<=>-5x=5-81=-76
<=>x=-76/-5=76/5=15,2
b) 30.(x+2)-6.(x-5)-24.x=100
<=> 30x+60-6x+30-24x=100
<=> 0x=100-60-30=10
=> không có giá trị nào của x để 0x=10
c) \(|5.x-2|< 13\)
Khi 5x-2 < 13
<=> 5x<15 <=> x<3
Khi 5x-2 <-13
<=> 5x<-11 <=> x<-11/5 <=> x<-2,2
4,34 * x + 6,76 * x = 4,995
= { 4,34 + 6,76 } * x = 4,995
x = 4,995 : { 4,34 + 6,76 } = 4,995 : 11,1 =0,45
\(\left(4,34+6,76\right)\cdot x=4,995\)
\(11,1\cdot x=4,995\)
\(x=4,995:11,1\)
\(x=0,45\)