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\(\left(x+2,5\right):2\frac{1}{2}-1,5=-1\frac{1}{4}\\ \left(x+2,5\right):2,5=-1\frac{1}{4}+1,5\\ x:2,5+1=\frac{-1}{4}\\ x:\frac{5}{2}=\frac{-5}{4}\\ x=\frac{-1}{2}\)
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\(=\dfrac{7}{10}.\dfrac{8}{3}.20.\dfrac{3}{8}.\dfrac{5}{28}=\dfrac{5}{2}\)
co 3 cach de tim ra tong
chu so hang tram co 3 cach chon
chu so hang chuc co 3 cach chon
chu so don vi co 3 cach chon
tong la 3 nhan 3 nhan 3 = 27
nho tist cho minh nha dung 100% do bai nay minh lam roi
Các số đó là:
- 123, 132
- 213, 231
- 312, 321
\(S=123+132+213+231+312+321=1332\)
\(\Leftrightarrow\dfrac{1}{3}\left(2x-5\right)=-\dfrac{2}{3}-\dfrac{3}{2}\)
\(\Leftrightarrow\dfrac{1}{3}\left(2x-5\right)=-\dfrac{13}{6}\)
\(\Leftrightarrow2x-5=-\dfrac{13}{6}:\dfrac{1}{3}\)
\(\Leftrightarrow2x-5=-\dfrac{13}{2}\)
\(\Leftrightarrow2x=-\dfrac{3}{2}\)
\(\Leftrightarrow x=-\dfrac{3}{4}\)
\(a,\Leftrightarrow x=7-4=3\\ b,\Leftrightarrow2x=-18+5=-13\\ \Leftrightarrow x=-\dfrac{13}{2}\\ c,\Leftrightarrow x-21=10\\ \Leftrightarrow x=31\\ d,\Leftrightarrow-12-x+19=0\\ \Leftrightarrow7-x=0\\ \Leftrightarrow x=7\)
a, <=> x=7-4
<=> x=3
b, 2x= -18 +5
<=>2x=-13
<=> x= -13/2
c, <=> x -21=-10
<=> x= -10 +21
<=> x=11
d, <=> -12+19 -x=0
<=> 7-x=0
<=> x=7
\(\dfrac{-3}{7}\times\dfrac{5}{9}+\dfrac{4}{9}\times\dfrac{-3}{7}\times2\dfrac{3}{7}=\dfrac{-3}{7}\times\left(\dfrac{5}{9}+\dfrac{4}{9}\right)+\dfrac{17}{7}=-\dfrac{3}{7}+\dfrac{17}{7}=\dfrac{14}{7}=2\)
\(\dfrac{-3}{7}.\dfrac{5}{9}+\dfrac{4}{9}.\dfrac{-3}{7}+2\dfrac{3}{7}\)
= \(\dfrac{-3}{7}.\dfrac{5}{9}+\dfrac{4}{9}.\dfrac{-3}{7}+\dfrac{17}{7}\)
=\(\dfrac{-3}{7}.\left(\dfrac{5}{9}+\dfrac{4}{9}\right)+\dfrac{17}{7}\)
= \(\dfrac{-3}{7}.1+\dfrac{17}{7}\)
= \(\dfrac{-3}{7}+\dfrac{17}{7}\)
= 2