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a: \(24,8:0,5+24,8\cdot3+24,8:0,2\)
\(=24,8\cdot2+24,8\cdot3+24,8\cdot5\)
\(=24,8\left(2+3+5\right)\)
\(=24,8\cdot10=248\)
b: \(19,5+19,5\cdot3+19,5:0,5+19,5:0,25\)
\(=19,5+19,5\cdot3+19,5\cdot2+19,5\cdot4\)
\(=19,5\left(1+3+2+4\right)\)
\(=19,5\cdot10=195\)
c: \(121,07\cdot4+121,07:0,25+121,07:0,5\)
\(=121,07\cdot4+121,07\cdot4+121,07\cdot2\)
\(=121,07\left(4+4+2\right)\)
\(=121,07\cdot10=1210,7\)
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(-0,5).(-23,4).(-0,2)
= (0,5.0,2).(-23,4)
= 0,1.(- 23,4)
= - 2,34
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a: =-12,45+12,45+23,4=23,4
b: =32,18-32,18-14,6+14,6+4,125=4,125
c: =4,5(-12,25-17,75)
=-4,5*30=-135
d: =3,4(-23,68-45,12-31,2)
=3,4*(-100)=-340
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a: 20:50=40%
b: 1,6:3,2=50%
c: 19,5:0,05=390=39000%
d: 8,4:28=30%
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5.11x - 3 = 2 . 11x
<=> 5.11x - 2 . 11x= 3
<=> 11x. (5- 2) = 3
<=> 11x .3 = 3
<=> 11x = 1
<=> x = 0
[(2x - 4 ) + 9] 3 = 36
<=> [(2x - 4 ) + 9] 3 = (32)3
<=> (2x - 4 ) + 9 = 32
<=> (2x - 4 ) + 9 = 9
<=> 2x - 4 = 0
<=> 2x = 4
<=> x = 2
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=1656.11 NHA BN
cac bn ung ho minh nha
có ai không giúp mình với