1 + 2 x 3 : 5 = ?
kb nhé
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A = 1x2 + 2x3 + 3x4 + 4x5 + ...+ 99x100
A x 3 = 1x2x3 + 2x3x3 + 3x4x3 + 4x5x3 + ... + 99x100x3
A x 3 = 1x2x3 + 2x3x(4-1) + 3x4x(5-2) + 4x5x(6-3) + ... + 99x100x(101-98)
A x 3 = 1x2x3 + 2x3x4 - 1x2x3 + 3x4x5 - 2x3x4 + 4x5x6 - 3x4x5 + ... + 99x100x101 - 98x99x100.
A x 3 = 99x100x101 A = 99x100x101 : 3 A = 333300 tích cho mình với, ko chat àh
\(\frac{2x-1}{3}=\frac{x+2}{5}-1\)
\(\Rightarrow\frac{2x-1}{3}=\frac{x-3}{5}\)
\(\Rightarrow\left(2x-1\right).5=3.\left(x-3\right)\)
\(\Rightarrow10x-5=3x-9\)
\(\Rightarrow10x-3x=-9+5\Rightarrow7x=-4\Rightarrow x=-\frac{4}{7}\)
\(x-\frac{3}{5}=\frac{4}{7}\) \(x+\frac{3}{5}=\frac{4}{3}\) \(-x-\frac{2}{7}=-\frac{8}{9}\)
\(x=\frac{4}{7}+\frac{3}{5}\) \(x=\frac{4}{3}-\frac{3}{5}\) \(-x=-\frac{8}{9}+\frac{2}{7}\)
\(x=\frac{41}{35}\) \(x=\frac{11}{15}\) \(-x=-\frac{38}{63}\)
\(x=\frac{38}{63}\)
\(\frac{7}{9}-x=\frac{1}{5}\)
\(x=\frac{7}{9}-\frac{1}{5}\)
\(x=\frac{26}{45}\)
\(\frac{1}{2}\)x \(\frac{2}{3}\)= \(\frac{1\times2}{2\times3}\)= \(\frac{2}{6}\)= \(\frac{1}{3}\)
\(\frac{4}{5}\): \(\frac{2}{4}\)= \(\frac{4}{5}\)x \(2\)= \(\frac{8}{5}\)
\(\frac{9}{8}\)+ \(\frac{1}{4}\)= \(\frac{36}{32}\)+ \(\frac{8}{32}\)= \(\frac{44}{32}\)= \(\frac{11}{8}\)
\(\frac{7}{4}\)- \(\frac{2}{4}\)= \(\frac{7-2}{4}\)= \(\frac{5}{4}\)
5 - ( 5 x 5 + 5 ) = - 25
kb nhé !!!!!!!!!!
a) 2(x + 3) = 5(1 - x) - 2
<=> 2x + 6 = 5 - 5x - 2
<=> 2x + 6 = 3 - 5x
=> 2x - 5x = 6 + 3
=> -3x = 9
=> x = 9 : (-3)
=> x = -3
2x - 3 = 54 : 52
2x - 3 = 54 - 2 = 52 = 25
2x = 25 + 3
2x = 28
x = 28 : 2
x = 14
5x + 2 = 53 . 125
5x + 2 = 53 . 53 = 53 + 3 = 56
=> x = 6 - 2
x = 4
kết quả bằng 45 nhé bạn, nhá, mình kết bạn với bạn rồi đó
(x2n+xnyn+y2n)(xn−yn)(x3n+y3n)=[(xn)2+xnyn+(yn)2](xn−yn)(x3n+y3n)=(x3n−y3n)(x3n+y3n)=x6n−y6n
= 2,2
ok kết bạn luôn
\(1+2x3:5=1+6:5=1+1,2+2,2\)