444/777+120/105+50/175=?
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777/444=7/4
120/105=8/7
50/175=2/7
7/4+8/7+2/7=7/4+5/7=49/28+20/28=69/28
\(\frac{444}{777}\)+\(\frac{120}{105}\)+ \(\frac{50}{175}\)= \(2\)
(111 + 222 + 333 + 444 + 555 + 666 + 777 + 888 + 999)x 2.................999 x 2 x 2 x 2 ?
A.(111 + 222 + 333 + 444 + 555 + 666 + 777 + 888 + 999)x 2 > 999 x 2 x 2 x 2 = 9990 > 7992
B.(111 + 222 + 333 + 444 + 555 + 666 + 777 + 888 + 999)x 2 < 999 x 2 x 2 x 2 = 9990 < 7992
C.(111 + 222 + 333 + 444 + 555 + 666 + 777 + 888 + 999)x 2 = 999 x 2 x 2 x 2 = 9990 = 7992
\(x=\frac{-25}{35}=\frac{-5}{7}\)
\(y=\frac{444}{-777}=\frac{111}{111}.\frac{-4}{7}\)
Vì \(\frac{-4}{7}>\frac{-5}{7}\Rightarrow\frac{111}{111}.\frac{-4}{7}>\frac{-5}{7}\Leftrightarrow x< y\)
1,X=−2535−2535=−57−57
Y=444−777444−777= −47−47
VÌ −47−47> −57−57
⇒X<Y
2,Y=110−50110−50= −115−115
X=−215−215
vì −215−215<−115−115
⇒y<x
-----------------------HỌC TỐT----------------------
111 + 333 + 666 + 777 +999 +444 + 555 +222
=(111+999) + (333+777) + (666 + 444) +(555+ 222)
=1110 + 1110+1110 + 777
=1110 * 3 + 777
= 3330+ 777=4107