168:Ý-42:Y=6
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(168 * 168-168*58) : 42
=18480 : 42
=440
0,9*95+1,8* 2+0,9
=90
1/ `|x|=10<=> x=\pm 10`
2/ `|x-8|=0<=>x-8=0<=>x=8`
3/ `7+|x|=12<=>|x|=5<=>x=\pm 5`
4/ `|x+1|=3`
$\Leftrightarrow\left[\begin{array}{1}x+1=3\\x+1=-3\end{array}\right.\\\Leftrightarrow\left[\begin{array}{1}x=3\\x=-4\end{array}\right.$
5/ `15-x=16-(14-42)`
`<=>15-x=16+28`
`<=>15-x=44`
`<=>x=-29`
6/ `210-(x-12)=168`
`<=>210-x+12=168`
`<=>222-x=168`
`<=>x=54`
a) \(\left(45x105-225\right)-\left(210+42x95\right)\)
\(=45x\left(100+5\right)-225-210+42x\left(100-5\right)\)
\(=4500+45x5-225-210+4200-42x5\)
\(=4500+4200+45x5-42x5-225-210\)
\(=8700+5x\left(45-42\right)-435\)
\(=8700+15-435=8280\)
a: =45*105-225-210-42*95
=45*(105-5)-42(95+5)
=100*3
=300
b: =47(105-5)-42(96+4)
=47*100-42*100
=5*100
=500
A=1,25+2,75+4,25+........+17,75+19,25
A có ( 19,25 - 1,25 ) : 1,5 + 1 = 13 số hạng.
A = ( 19,25 + 1,25 ) . 13 : 2
A = 133,25
B = 5,8 . ( 168 - 100 ) + ( 4,5 + 1,3) . ( 15 + 26) + (7,3 - 1,5 )
B = 5,8 . 68 + 5,8 + 5,8
B = 5,8 ( 68 + 1 + 1 )
B = 5,8 . 70
B = 406
\(C=\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}+\frac{1}{56}\)
\(C=\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}\)
\(C=\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}\)
\(C=\frac{1}{2}-\frac{1}{8}\)
\(C=\frac{3}{8}\)
168 : Y - 42 : Y = 6
( 168-42 ) : Y = 6
126 : Y = 6
Y = 126 : 6
Y = 21
y*[168:42]=6
y*4=6
y=6:4
y=1,5