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a)
x – 8 + 32 = 68
x – 8 = 68 – 32
x – 8 = 36
x = 36 + 8
x = 44
b)
x + 8 + 32 = 68
x + 8 = 68 – 32
x + 8 = 36
x = 36 – 8
x = 28
c)
98 – x + 34 = 43
98 – x = 43 – 34
98 – x = 9
x = 98 – 9
x = 89
d)
98 + x – 34 = 43
98 + x = 43 + 34
98 + x = 77
x = 98 – 77
x = 21
tick cho mink nhé!
= 1046,4 + 1030,4 + 1123,2
= 2076.8 + 1123,2
= 3200
X : 8 x 32 + X : 3 x 18 - X : 5 x 10 = 120
X : (32 :8 ) + X : ( 18 :3 ) - X : ( 10 : 5 )
X = ( 4 +6 -2 )=120
X= 8 = 120
X=120 :8
X = 15
\(x\div8\times32+x\div3\times18-x\div5\times10=120\)
\(x\div\left(8\div32\right)+x\div\left(3\div18\right)-x\div\left(5\div10\right)=120\)
\(x\div\frac{1}{4}+x\div\frac{1}{6}-x\div\frac{1}{2}=120\)
\(x\div\left(\frac{1}{4}+\frac{1}{6}-\frac{1}{2}\right)=120\)
\(x\div\frac{-1}{12}=120\)
\(x=120\times\frac{-1}{12}\)
\(x=-10\)
4 + x = 7 - 2x
4 + x + 2x = 7
4 + 3x = 7
3x = 7 - 4
3x = 3
x = 3 : 3
x =1
5 + x = 8,3 + 4,7 - x
5 + x + x = 8,3 + 4,7
5 + 2x = 13
2x = 13 - 5
2x = 8
x = 8 : 2
x= 4
2/3 x 4/5 + 4/5 x 8/3 = 4/5 x (2/3 + 8/3) = 4/5 x 10/3 = 8/3
27/32 x 16/9 -27/32 x7/9 + 27/32
= 27/32 x (16/9 - 7/9 + 1 )
=27/32 x 2
=27/16
\(\frac{2}{3}\) x \(\frac{4}{5}\) + \(\frac{4}{5}\) x \(\frac{8}{3}\)
=\(\frac{4}{5}\) x ( \(\frac{2}{3}\) + \(\frac{8}{3}\) )
= \(\frac{4}{5}\) x \(\frac{10}{3}\)
= \(\frac{40}{15}\) = \(\frac{8}{5}\)
X x 1,68 + X x 8,32 = 400
X x ( 1,68 + 8,32 ) = 400
X x 10 = 400
X = 400 : 10
X = 40
\(x\left(1,68+8,32\right)=400\)
\(x.10=400\)
\(x=40\)