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\(\frac{0,4\cdot13,68\cdot0,9 +0,6\cdot48,24\cdot0,6+0,2\cdot38,08\cdot1,8}{5:0,125+8:0,25}\)
Tử số : 0,4 x 13,68 x 0,9 +0,6 x 48,24 x 0,6 + 0,2 x 38,08 x 1,8
= 0,36 x 13,68 + 0,36 x 48,24 + 0,36 x 38,08
= 0,36 x ( 13,68 + 48,24 + 38,08 )
= 0,36 x 100
= 36
Mẫu số : 5 : 0,125 + 8 : 0,25
= 5 x 8 + 8 x 4
= 8 x ( 5 + 4 )
= 8 x 9
= 27
Vậy : \(\frac{0,4\cdot13,38\cdot0,9+0,6\cdot48,24\cdot0,6+0,2\cdot38,08\cdot1,8}{5:0,125+8:0,25}=\frac{36}{27}=\frac{4}{3}\)
\(\text{30.(x+2)-6.(x+5)-24x=100}\)
\(30x+60-6x-30-24x=100\)
\(30x-6x-24x=100+30-60\)
\(0=70\\ \Rightarrow x\in\varnothing\)
\(\text{-12.(x-15)+7.(3-x)=15}\)
\(-12x+180+21-7x=15\)
\(-12x-7x=15-21-180\)
\(-19x=-186\)
\(x=\frac{186}{19}\)
\(\text{-(574+x)=(x-12-741)-23}\)
\(-574-x=x-12-741-23\)
\(-x-x=-752+574\)
\(-2x=-178\)
\(x=89\)
chúc bạn học tốt !!!
0,2xX-\(\frac{7}{5}\)xX=-\(\frac{42}{45}\)
X=0,7777777778
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: \(121,07\cdot4+121,07:0,25+121,07:0,5\)
\(=121,07\cdot4+121,07\cdot4+121,07\cdot2\)
\(=121,07\left(4+4+2\right)\)
\(=121,07\cdot10=1210,7\)
179 x 24 - 48 x 89
= 179 x 24 - 24 x 2 x 89
= 24 x ( 179 - 2x89)
= 24 x ( 179 - 178)
= 24 x 1
= 24
a 7/3.x-0,6=1.3
7/3.x-0,6=3
7/3.x=3+0,6
7/3.x=3,6
x=3,6;7/3
x=54/35
b ta có (1/2.x-21)(0,5-x)=0
với 1/2.x-21=0 ta co
1/2.x=0+21
1/2.x=21
x=21;1/2
x=42
với 0,5-x=0 ta co
x=0+0,5
x=0,5
vậy x =42 hoac x=0,5
a, y \(\times\) \(\dfrac{4}{3}\) = \(\dfrac{16}{9}\)
y = \(\dfrac{16}{9}\) : \(\dfrac{4}{3}\)
y = \(\dfrac{4}{3}\)
b, ( y - \(\dfrac{1}{2}\)) + 0,5 = \(\dfrac{3}{4}\)
y - 0,5 + 0,5 = \(\dfrac{3}{4}\)
y = \(\dfrac{3}{4}\)
c, \(\dfrac{4}{5}-\dfrac{2}{5}y\) = 0,2
0,8 - 0,4y = 0,2
0,4y = 0,8 - 0,2
0,4y = 0,6
y = 1,5
d, (y + \(\dfrac{3}{4}\)) \(\times\) \(\dfrac{5}{7}\) = \(\dfrac{10}{9}\)
y + \(\dfrac{3}{4}\) = \(\dfrac{10}{9}\) : \(\dfrac{5}{7}\)
y + \(\dfrac{3}{4}\) = \(\dfrac{14}{9}\)
y = \(\dfrac{14}{9}\) - \(\dfrac{3}{4}\)
y = \(\dfrac{29}{36}\)
e, y : \(\dfrac{5}{4}\) = \(\dfrac{9}{5}\) + \(\dfrac{1}{2}\)
y : \(\dfrac{5}{4}\) = \(\dfrac{23}{10}\)
y = \(\dfrac{23}{10}\)
y = \(\dfrac{23}{8}\)
f, y \(\times\) \(\dfrac{1}{2}\) + \(\dfrac{3}{2}\) \(\times\) y = \(\dfrac{4}{5}\)
y \(\times\) ( \(\dfrac{1}{2}+\dfrac{3}{2}\)) = \(\dfrac{4}{5}\)
2y = \(\dfrac{4}{5}\)
y = \(\dfrac{2}{5}\)
`3(x-0,5)-5(x+0,6)=-x+0,2`
`=>3x-1,5-5x-3=-x+0,2`
`=>3x-5x+x=0,2+1,5+3`
`=>-x=4,7`
`=>x=-4,7`
dễ vãi ò. làm đi