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a) x=9,03:2,1=4,3
b)x=9,66:3,45=2,8
c)x=23,5x9,4=220,9
d)x=0,85x2,21=1,8785
a,X=9,03:2,1
X=4,3
b,x=9,66:3,45
x=2,8
c x=23,5:9,4
x=2,5
dx=2,21:0,85
x=2,6
\(\left(a\right)y\times1,4\div1,5=2,8\)
\(\Leftrightarrow y\times1,4=2,8\times1,5\)
\(\Leftrightarrow y\times1,4=4,2\)
\(\Leftrightarrow y=4,2\div1,4\)
\(\Leftrightarrow y=3\)
\(\left(b\right)y\times1,02=3,57\times3,06\)
\(\Leftrightarrow y\times1,02=10,9242\)
\(\Leftrightarrow y=10,9242\div1,02\)
\(\Leftrightarrow y=10,71\)
\(\left(c\right)15\div y-0,85=0,35\)
\(\Leftrightarrow15\div y=0,35+0,85\)
\(\Leftrightarrow15\div y=1,2\)
\(\Leftrightarrow y=15\div1,2\)
\(\Leftrightarrow y=12,5\)
\(\left(d\right)471,5-22,5\times y=12,5\)
\(\Leftrightarrow22,5\times y=471,5-12,5\)
\(\Leftrightarrow22,5\times y=459\)
\(\Leftrightarrow y=459\div22,5\)
\(\Leftrightarrow y=20,4\)
Kukad'z Lee'z
\(\left(a\right)y\times1,4\div1,5=2,8\)
\(\Leftrightarrow y\times1,4=2,8\times1,5\)
\(\Leftrightarrow y\times1,4=4,2\)
\(\Leftrightarrow y=4,2\div1,4\)
\(\Leftrightarrow y=3\)
\(\left(a\right)y\times1,4\div1,5=2,8\)
\(\Leftrightarrow y\times1,4=2,8\times1,5\)
\(\Leftrightarrow y\times1,4=4,2\)
\(\Leftrightarrow y=4,2\div1,4\)
\(\Leftrightarrow y=3\)
`a) x xx 2,1 = 9,03`
`=> x = 9,03 : 2,1`
`=> x = 4,3`
__
`b) 3,45 xx x = 9,66`
`=> x = 9,66 : 3,45`
`=> x = 2,8`
__
`c) x : 9,4 = 23,5`
`=> x = 23,5 xx 9,4`
`=> x = 220,9`
__
`d) 2,21 : x = 0,85`
`=> x = 2,21 : 0,85`
`=> x = 2,6`
a. X x 2,1 = 9,03
x =9,03 : 2,1
x = 4,3
b. 3,45 x X = 9,66
x = 9,66 : 3,45
x = 2,8
c. X : 9,4 = 23,5
x = 23,5 x 9,4
x = 220,9
d. 2,21 : X = 0,85
x = 2,21:0,85
x = 2,6
a) X x 21 = 9,03
X = 9,03 : 21
X = 0,43
b) 3 x X = 9,66
X = 9,66 : 3 = 3,22
c) X : 9,4 = 23,5
X = 23,5 x 9,4 = 220,9
d) 2,21 : X = 0,85
X = 2,21 : 0,85 = 2,6
\(\left(1+x\right)+\left(2+x\right)+\left(3+x\right)+\)\(\left(4+x\right)+\left(5+x\right)=10\times5\)
\(\left(1+2+3+4+5\right)+\left(x+x+x+x+x\right)=50\)
\(15+5x=50\)
\(5x=35\)
\(x=7\)
Vậy \(x=7\)
\(\left(1+x\right)+\left(2+x\right)+\left(3+x\right)+\left(4+x\right)+\left(5+x\right)=10\times5\)
\(\Rightarrow1+x+2+x+3+x+4+x+5+x=50\)
\(\Rightarrow\left(1+2+3+4+5\right)+\left(x+x+x+x+x\right)=50\)
\(\Rightarrow15+5x=50\)
\(\Rightarrow5x=50-15\)
\(\Rightarrow5x=35\)
\(\Rightarrow x=35:5\)
\(\Rightarrow x=7\).
2,21 : x = 0,85
x = 2,21 : 0,85
x = 2,6