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\(Xx9-1,5=30\)
\(Xx9=30+1,5\)
\(Xx9=31,5\)
\(X=31,5:9\)
\(X=3,5\)
( X- 25): 45+ 120= 150.
( X- 25): 45= 150- 120.
( X- 25): 45= 30.
( X- 25)= 30x 45.
( X- 25)= 1350.
X= 1350- 25.
X= 1325.
1
a,80+40-82+30=68
b,32x56+45-32x32=813
2
a12/7:x+2/3=7/5
12/7:x=7/5+2/3
12/7:x=31/15
x=31/15.12/7
x=124/35
\(a,30+X=120:5+27\\ 30+X=24+27\\ 30+X=51\\ X=51-30=21\\ ---\\ b,40-3\times X=13\\ 3\times X=40-13=27\\ X=\dfrac{27}{3}=9\\ ---\\ 2\times X-8=16\\ 2\times X=16+8\\ 2\times X=24\\ X=\dfrac{24}{2}=12\\ \\---\\ \dfrac{1}{2}\times X-\dfrac{1}{3}=\dfrac{1}{4}\\ \dfrac{1}{2}\times X=\dfrac{1}{4}+\dfrac{1}{3}=\dfrac{7}{12}\\ X=\dfrac{7}{12}:\dfrac{1}{2}=\dfrac{7}{6}\)
ta có : 5 - (12 - x) - 20 = 30
=> 5 - (12 - x) = 30 + 20
=> 5 - (12 - x) = 50
=> (12 - x) = -45
=> x = -12 - (-45)
=> x = 33
x(100%+20%)=7.2
x120%=720%
x=720%:120%
x=6
vậy////////
(40%+100%)x+20%=720%
140%x=720%-20%
140%x=700%
x=720%:140%
x=36/7
vậy x=/////////////
\(x\) - 120 : 30 = 40
\(x\) - 4 = 40
\(x\) = 40 + 4
\(x\) = 44