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\(4,7\div0,25+5,3\times4\)
\(=18,8+21,2\)
\(=40\)
\(3\times\left(a-2\right)+150=240\)
\(3\times\left(a-2\right)=90\)
\(a-2=30\)
\(a=32\)
\(\dfrac{1}{9}+a+\dfrac{7}{12}=\dfrac{17}{18}\)
\(\dfrac{1}{9}+a=\dfrac{13}{36}\)
\(a=\dfrac{1}{4}\)
\(\left(\dfrac{1}{2}\times\dfrac{1}{3}+\dfrac{1}{3}\times\dfrac{1}{4}+\dfrac{1}{4}\times\dfrac{1}{5}+\dfrac{1}{5}\times\dfrac{1}{6}+\dfrac{1}{6}\times\dfrac{1}{7}+\dfrac{1}{7}\times\dfrac{1}{8}\right)\times a=\dfrac{9}{16}\)
\(\left(\dfrac{1}{2\times3}+\dfrac{1}{3\times4}+\dfrac{1}{4\times5}+\dfrac{1}{5\times6}+\dfrac{1}{6\times7}+\dfrac{1}{7\times8}\right)\times a=\dfrac{9}{16}\)
\(\left(\dfrac{1}{2}-\dfrac{1}{8}\right)\times a=\dfrac{9}{16}\)
\(\dfrac{3}{8}\times a=\dfrac{9}{16}\)
\(a=\dfrac{3}{2}\)
x / (2/7) = x * 7/2
rồi lấy x làm thừa số chung, rồi tính thừa số kia, rồi tìm x
123,45 + 23,56 +76,44 + 54,55
= (123,45 + 54,55) + (23,56 + 76,44)
= 178 + 100
= 278
456 x 45 + 456 x 10 + - 456 x 55
=456 x (45 +10-55)
=456 x 0
=0
2,5 x 8,5 + 7,5 x 8,5
=8,5 x (2,5 +7,5)
= 8,5 x 10
= 85
86 x 5 + 86 x 4 + 86
= 86 x (5+4+1)
= 86 x10
860
2/2/17 x 1/1/24 x 5/2/5 x 3/7/9 x 2
36/17 x 25/24 x 27/5 x 34/9 x 2
36 x 25 x 27 x 34 x 2/17 x 24 x 5 x 9
1652400/18360=90
a)x*5,2:4,5=10,4
x*5,2=10,4*4,5
x*5,2=46,8
x =46,8:5,2
x =9
b)5/7*x+2/7*x=2/3
x*(5/7+2/7)=2/3
x*1 =2/3
x =2/3:1
x =2/3
a.
\(x\times5,2\div4,5=10,4\)
\(x\times5,2=10,4\times4,5\)
\(x\times5,2=46,8\)
\(x=46,8\div5,2\)
\(x=9\)
b.
\(\dfrac{5}{7}\times x+\dfrac{2}{7}\times x=\dfrac{2}{3}\)
\(x\times\left(\dfrac{5}{7}+\dfrac{2}{7}\right)=\dfrac{2}{3}\)
\(x\times1=\dfrac{2}{3}\)
\(x=\dfrac{2}{3}\div1\)
\(x=\dfrac{2}{3}\)
\(x\): 2 + \(x\):4 \(\times\) 3 + \(\dfrac{1}{2}\)+ \(x\) + \(x\) : \(\dfrac{2}{3}\) = 1
\(x\) \(\times\) 0,5 + \(x\) \(\times\) 0,25 \(\times\) 3 + 0,5 + \(x\) + \(x\) \(\times\) \(\dfrac{3}{2}\) = 1
\(x\) \(\times\)( 0,5 + 0,25 \(\times\) 3 + 1 + \(\dfrac{3}{2}\)) + 0,5 = 1
\(x\) \(\times\) ( 0,5 + 0,75 + 1 + 1,5) + 0,5 = 1
\(x\) \(\times\) 3,75 + 0,5 = 1
\(x\) \(\times\)3,75 = 1 - 0,5
\(x\) \(\times\) 3,75 = 0,5
\(x\) =0,5 : 3,75
\(x\) = \(\dfrac{2}{15}\)
= 0,75 x 0,25 + 0,75 x 1,25 - 0,75 x 0,5
= 0,75 x ( 0,25 + 1,25 - 0,5 )
= 0,75 x 1
= 0,75
\(\dfrac{9}{2}\times x-\dfrac{3}{2}\times\left(x+2\right)=24\\ \dfrac{9}{2}\times x-\dfrac{3}{2}\times x-3=24\\ \left(\dfrac{9}{2}-\dfrac{3}{2}\right)\times x=24+3\\ 3\times x=27\\ x=27:3=9\)
Vậy x=9
\(\dfrac{9}{2}\text{x}X-\dfrac{3}{2}\text{x}\left(X+2\right)=24\)
=>\(\dfrac{9}{2}\text{x}X-\dfrac{3}{2}\text{x}-3=24\)
=>\(3xX=27\)
=>X=27:3=9