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10 - x = 46,8 : 6,5
10 - x = 36/5
x = 10 - 36/5
x = 14/5
Vậy x = 14/5.
10 - x : 2,5 = 46,8 : 6,5
10 - x : 2,5 = 7,2
x : 2,5 = 10 - 7,2
x : 2,5 = 2,8
x = 2,8 * 2,5
x = 7
10 - x = 7,2
x = 10 - 7,2
x = 2,8
= 16,5 x 1,84
= 30,36
`10 - x = 46,8 : 6,5`
`10 - x = 7,2`
`x = 10 - 7,2`
`x = 2,8`
__________________________
`16,5 xx (2,32 - 0,48)`
`= 16,5 xx 1,84`
`= 30,36`
a. xem lại đề bạn nhé!
b. 12,3 : X x 4,5 = 6
12,3 : X = 6 : 4,5
12,3 : X = \(\frac{6}{4,5}\)
X = 12,3 : \(\frac{6}{4,5}\)
X = 9,225
Vậy :....
c. 100 x ( X + 2,8 ) = 988,3
X + 2,8 = 988,3 : 100
X + 2,8 = 9,883
X = 9,883 - 2,8
X = 7,083
Vậy: X = ...
d. ( X - 45,6 ) x 100 = 999,89
X - 45,6 = 999,89 : 100
X - 45,6 = 9,9989
X = 9,9989 + 45,6
X = 55,5989
Vậy: ....
Nhớ k cho mình nhé! Thank you!!!
10 - x = 46,8 : 6,5 16,5 x (2,32 - 0,48)
\(10-x=46,8:6,5\times16,5\times1,84\)
\(10-x=7,2\times16,5\times1,84\)
\(10-x=118,8\times1,84\)
\(10-x=218,592\)
\(x=10-218,592\)
\(x=-208,592\)
Bai 1 :
a/ \(x:1,4+2,8=8,4\)
\(x:1,4=8,4-2,8\)
\(x:1,4=5,6\)
\(x=5,6\times1,4\)
\(x=7,84\)
b/ \(2,8:x-1,5=2,3:5,75\)
\(2,8:x-1,5=\frac{2}{5}\)
\(2,8:x=\frac{2}{5}+1,5\)
\(2,8:x=\frac{19}{10}=1,9\)
\(\Rightarrow x=2,8:1,9=\frac{28}{19}\)
Bai 2 :
a/ \(575-\left(6\times x+70\right)=445\)
\(6\times x+70=575-445\)
\(6\times x+70=130\)
\(6\times x=130-70\)
\(\Rightarrow6\times x=60\Rightarrow x=10\)
b/ \(315+\left(125-x\right)=435\)
\(125-x=435-315\)
\(125-x=120\)
\(\Rightarrow x=5\)
c/ \(\left(x-105\right):21=15\)
\(x-105=15\times21\)
\(x-105=315\)
\(\Rightarrow x=420\)
d/ \(3636:\left(12\times x-91\right)=36\)
\(12\times x-91=3636:36\)
\(12\times x-91=101\)
\(12\times x=101+91\)
\(12\times x=192\)
\(\Rightarrow x=16\)
e/ \(12\times\left(x-5\right)+73=20\)
\(12\times\left(x-5\right)=20-73\)
\(12\times\left(x-5\right)=-53\)
\(x-5=-53:12\)
\(x-5=\frac{-53}{12}\)
\(\Rightarrow x=\frac{-53}{12}+5\)
\(\Rightarrow x=\frac{7}{12}\)
f/ \(\left[\left(10-x\right)\times2+5\right]:3-2=3\)
\(\left[\left(10-x\right)\times2+5\right]:3=3+2\)
\(\left[\left(10-x\right)\times2+5\right]:3=5\)
\(\left[\left(10-x\right)\times2+5\right]=5\times3\)
\(\left(10-x\right)\times2+5=15\)
\(\left(10-x\right)\times2=15-5\)
\(\left(10-x\right)\times2=10\)
\(10-x=10:2\)
\(10-x=5\)
\(\Rightarrow x=5\)
\(10-x=46,8:6,5\Leftrightarrow10-x=7,2\Leftrightarrow x=2,8\)
Chọn A
10 - x = 46,8 : 6,5
10 - x = 7,2
x= 10-7,2 x = 2,8cho lên chọn a