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\(x.5-x-9-x=15.\)
\(\Rightarrow5x-x-x-9=15\)
\(\Rightarrow3x=15+9=24\)
\(\Rightarrow x=24:3=8\)
Vậy x = 8
Ủng hộ tớ nha!
x x 15 - x - 9 - x = 15
X x 15 - 9 = 15
X - 9 = 15 : 15
X - 9 = 1
X = 1 + 9 = 10
Ko chắc đâu
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a) = 456 x (1 + 3 + 5) = 456 x 9
b) = 15 + 9 x 15 = 15 x (1 + 9) = 15 x 10
c) 1994 + 5 x 1994 = 1994 x (1 + 5) = 1994 x 6
a) 456 + 456 x 3 + 456 x 5
= 456 x ( 1 + 3 + 5 )
= 456 x 9
b) 15 + 9 + 9 + ... + 9 ( có 15 số 9 )
= 15 + 9 x 15
= 15 x ( 1 + 9 )
= 15 x 10
c) 1994 + 5 + 5 +... + 5 ( có 1994 số 5 )
= 1994 + 5 x 1994
= 1994 x ( 1 + 5 )
= 1994 x 6
~ Thiên Mã ~
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15 + 15 = 30
9 + 67 = 76
45 - 36 = 9
96 - 23 = 73
900 - 456 = 444
tk mk nha
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37 x 18 - 9 x 14 + 100
=37*2*9-9*14+100
=74*9-9*14+100
=9*(74-14)+100
=9*60+100
=540+100
=640
15 x 2 + 15 x 3 + 15 x 5
=15*(2+3+5)
=15*10
=150
52 + 37 + 48 + 63
=(52+48)+(37+63)
=100+100
=200
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( y + 15 ) : 9 = 24 : 6
( y + 15 ) : 9 = 4
y + 15 = 4 x 9
y + 15 = 36
y = 36 - 15
y = 11
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15-9=6
15 - 9 = 6