4a) \(\frac{x}{36}=\frac{3}{4}\)
\(\Rightarrow\frac{x}{36}=\frac{27}{36}\)
\(\Rightarrow x=27\)
4b) 33 + x = 71 - 26
33 + x = 45
x = 45 - 33
x = 12
4c) x * (3,5 + 1,5) = 10
x * 5 = 10
x = 10 ; 5 = 2
4,
\(a,\frac{x}{36}=\frac{24}{32}\)
\(=>\frac{x}{36}=\frac{3}{4}=\frac{27}{36}\)
\(=>x=27\)
\(b,71-\left(33+x\right)=26\)
\(=>-\left(33+x\right)=26-71=-45\)
\(=>33+x=45\)
\(=>x=12\)
\(c,3,5\cdot x+1,5\cdot x=10\)
\(>x\cdot\left(3,5+1,5\right)=10\)
\(=>x\cdot5=10\)
\(=>x=2\)
. là nhân nha
4.
a) x/36 = 24/32
24/32 = 3/4 = 27/36
=> x = 27
b) 71 - ( 33 + x ) = 26
33 + x = 71 - 26
33 + x = 45
x = 45 - 33
x = 12
c) 3, 5 . X + 1, 5 . x = 10
x( 3, 5 + 1, 5 ) = 10
x . 5 = 10
x = 10 : 5
x = 2
5.
a) 4, 63 . 7, 8 + 7, 8 + 7, 8 . 4, 32
= 7, 8. ( 4, 63 + 4, 32 + 1 )
= 7, 8 . 9, 95
= 77, 61
b) 35 . 34 + 35 . 86 + 65 . 75 + 65 . 45
= 35( 34 + 86 ) + 65( 75 . 45 )
= 35 . 120 + 65 . 120
= 120 . ( 35 + 65 )
= 120 . 100
= 12 000
5,
\(a;4,63\cdot7,8+7,8+7,8\cdot4,32\)
\(=7,8\cdot\left(4,63+1+4,32\right)\)
\(=7,8\cdot9,95\)
\(=77,61\)
\(b;35\cdot34+35\cdot86+65\cdot75+65\cdot45\)
\(=35\cdot\left(34+86\right)+65\cdot\left(75+45\right)\)
\(=35\cdot120+120\cdot65\)
\(=120\cdot\left(35+65\right)\)
\(=120\cdot100=120000\)
ti ck nha
