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a)\(x\cdot150+480=430+150\)
\(x\cdot150+480=580\)
\(x\cdot150=580-480=100\)
\(x=100:150=\frac{2}{3}\)
b) \(\frac{5}{9}:x=\frac{2}{5}\)
\(x=\frac{5}{9}:\frac{2}{5}=\frac{25}{18}=1\frac{7}{18}\)
~học tốt~.
\(x\cdot150+480=430+150\)
\(x\cdot150+480=580\)
\(x\cdot150=580-480\)
\(x\cdot150=100\)
\(x=150:100\)
\(x=\frac{3}{2}\)
\(\frac{5}{9}:x=\frac{2}{5}\)
\(x=\frac{5}{9}:\frac{2}{5}\)
\(x=\frac{5}{9}\cdot\frac{5}{2}\)
\(x=\frac{25}{18}\)
Dấu \(\cdot\) là dấu nhân
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câu 1: 3,2
câu 2: 40
câu 3: 12
câu 4: 42
nhớ cho mình nhé !
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25 x ( x - 2 ) - 5=45
25 x ( x - 2 ) = 45 + 5
25 x ( x - 2 ) = 50
x - 2 = 50 : 25
x - 2 = 2
x = 2 + 2
x = 4
30 - 2 x ( x - 1 )=4
2 x ( x - 1 ) = 30 - 4
2 x ( x - 1 ) = 26
x - 1 = 26 : 2
x - 1 = 13
x = 12
3 x (x - 2)-4=17
3 x ( x - 2 ) = 17 + 4
3 x ( x - 2 ) = 21
x - 2 = 21 : 3
x - 2 = 7
x = 7 + 2
x = 9
75 - 2 x ( x - 1 )= 13
2 x ( x - 1 ) = 75 - 13
2 x ( x - 1 ) = 62
x - 1 = 62 : 2
x - 1 = 31
x = 31 + 1
x = 32
nha bạn
\(25.\left(x-2\right)-5=45\)
\(25.\left(x-2\right)=50\)
\(x-2=2\)
\(x=4\)
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= 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
= ghi đề bài.......=0,75 + 0,75 x 29 + 0,75 x 30 + 0,75 x 40
=0,75 x (29 + 30 + 40 + 1)
=0,75 x 100
=75
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\(\frac{75}{100}+\frac{3}{4}.29+75\%.30+0,75.40\)
\(=0,75+0,75.29+0,75.30+0,75.40\)
\(=0,75.\left(1+29+30+40\right)\)
\(=0,75.100\)
\(=75\)
=75/100+3/4 x 29 +75/100 x 30 + 75/100 x 40
= 75/100* (30+40)+ 3/4
=3/4*70+3/4
=3/4+3/4 * 70
=70
viết hơi dài rút ngắn lại nhé viết cho dễ hiểu thôi nha ^_^
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= 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
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\(75\%\times x+\frac{3}{4}\times x+x=30\)
\(\frac{3}{4}\times x+\frac{3}{4}\times x+x\times1=30\)
\(x\times\left(\frac{3}{4}+\frac{3}{4}+1\right)=30\)
\(x\times\frac{5}{2}=30\)
\(x=30\div\frac{5}{2}\)
\(x=12\)
Vậy \(x=12\)
2.x+3.x=430
=> x ( 2 + 3) = 430
=> x . 5 = 430
=> x = 430 : 5 = 86
75-5.x=30
=> 5x = 75 - 30
=> 5x = 45
=> x= 9
Vậy x = 9
2.x+3.x=430 75-5.x=30
2x+3x=430 75-5x=30
5x=430 5x=45
x=86 x=9