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a) 75% x X+ 3/4 = 30
75%x X= 30-3/4
75%x X=117/4
X=117/4 : 75/100
X=117/4 x 100/75
X= 39
75%* X+3/4*X+X=30
3/4*X+3/4*X+X=30
(3/4+3/4+1)*X=30
10/4*X=30
X=30:10/4 X=12
\(=\dfrac{3}{4}\left(1+29+30+40\right)=\dfrac{3}{4}\cdot100=75\)
\(\frac{75}{100}+\frac{3}{4}\times29+75\%\times30+0,75\times40\)
\(=0,75+0,75\times29+0,75\times30+0,75\times40\)
\(=0,75\times(1+29+30+40)\)
\(=0,75\times100\)
\(=75\)
(75 / 100) + ((3 / 4) x 29) + (75% x 30) + (0,75 x 40) =
75 |
3/4 x X + 3/4 x X + X x 1 = 30
X x ( 3/4 + 3/4 + 1 ) = 30
X x 5/2 = 30
X = 30 : 5/2
x= 12
Vậy x = 12
\(75\%\times x+\frac{3}{4}\times x+x=30\)
\(\frac{3}{4}\times x+\frac{3}{4}\times x+x\times1=30\)
\(\left(\frac{3}{4}+\frac{3}{4}+1\right)\times x=30\)
\(\frac{5}{2}\times x=30\)
\(x=30\div\frac{5}{2}\)
\(x=\frac{30\times2}{5}\)
\(x=\frac{60}{5}=12\)
Vậy x = 12
câu 1: 3,2
câu 2: 40
câu 3: 12
câu 4: 42
nhớ cho mình nhé !
= 3/4 + 3/4 x 29 + 3/4 x 30 + 3/4 x 40
= 3/4 x ( 1 + 29 + 30 + 40)
= 3/4 x 100
= 75
a) \(75\%\times x+\frac{3}{4}\times x+x=30\)
\(\frac{3}{4}\times x+\frac{3}{4}\times x+x=30\)
\(x\times\left(\frac{3}{4}+\frac{3}{4}+1\right)=30\)
\(x\times\frac{5}{2}=30\)
\(x=30\div\frac{5}{2}\)
\(x=30\times\frac{2}{5}\)
\(x=12\)
b) \(x-40\%=36\)
\(x-\frac{2}{5}=36\)
\(x=36+\frac{2}{5}\)
\(x=36\frac{2}{5}\)
c) \(30\%\times x+x=52\)
\(\frac{3}{10}\times x+x=52\)
\(x\times\left(\frac{3}{10}+1\right)=52\)
\(x\times\frac{13}{10}=52\)
\(x=52\div\frac{13}{10}\)
\(x=40\)