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2x*(48-12x)-10*(48-12x)=0
=> (48-12x).(2x-10)=0
=> 48-12x=0 hoặc 2x-10=0
=> 12x=48-0 hoặc 2x =0+10
=> 12x=48 hoặc 2x =10
=> x=48:12 hoặc x =10:2
=> x=4 hoặc x =5
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a,(38-129+43)-(43+38)=38-129+43-43-38=(38-38)+(43-43)-129=-129
b,-144-[29-(+144)-(-144)=-144-29+144-144=(144-144)-29-144=-173
c)48+|48-174|+(-74)=18+126-74=70
d)(-123+77)-(277-23-123)=-123+77-277+23+123=(-123+123)+(77-277)+23=-200+23=-177
e)-(-57-159)+(43-169)=57+129+43-169=(57+43)+(129-169)=100-40=60
Chúc bạn học tốt( sai chỗ nào cho mjk sr nka??) k cho mjk nka
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84/144 = 7/12 225/60 = 15/4 169/65 = 13/5
64/48 = 4/3 96/42 = 16/7
( 7/12 - 15/4 - 13/5 ) : ( 3/2 - 4/3 - 16/7 )
= -173/30 : -89/42
= 1221/445
84/144 = 7/12;225/60 = 15/4;169/65 = 13/5;64/48 = 4/3;96/42 = 16/7
( 7/12 - 15/4 - 13/5 ) : ( 3/2 - 4/3 - 16/7 )
= -173/30 : -89/42
= 1221/445
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a, 12x+156=144
<=>12x =144-156
<=>12x =-12
<=>x =-12:12
<=>x =-1
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B)
28=22.7
48=24.3
ƯCLN (28,48)= 2.3.7=42.
d)ƯCLN(51, 102, 144) = 3, suy ra ƯC(51, 102, 144) = {1; 3}
(12x - 48)^2 = 114
(12x - 48)^2 = 12^2
(12x - 48)= 12
12x = 12+48
12x = 60
x = 60/12
x = 5
(12x-48)2=144
(12x-48)2= 122 ( cũng có thể nói 12x-48 = \(\sqrt{144}\))
=>12x-48=12
12x = 12 + 48 = 60
x = 60:12
x = 5