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a) \(18,5:4,6+14,8:4,6+12,7:4,6\)
\(=\left(18,5+14,8+12,7\right):4,6\)
\(=46:4,6=10\)
b) \(0,75.1,3+0,25.1,3\)
\(=\left(0,75+0,25\right).1,3\)
\(=1.1,3=\dfrac{13}{10}\)
a) \(18,5:4,6+14,8:4,6+12,7:4,6\)
\(=\dfrac{18,5}{4,6}+\dfrac{14,8}{4,6}+\dfrac{12,7}{4,6}\)
\(=\dfrac{1}{4,6}.\left(18,5+14,8+12,7\right)\)
\(=\dfrac{1}{4,6}.46=10\)
b) \(...=1,3.\left(0,75+0,25\right)=1,3.1=1,3\)
c) \(...=0:31,792=0\)
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3,45 nhân 3+3,45 nhân 2+3,45 nhân 5
=3,45 nhân[3+2+5]
=3,45 nhân 10
=34,5
`34,5 xx 3 + 3,45 : 0,5 + 3,45 : 0,2`
`= 34,5 xx 3 + 3,45 xx (5 + 2)`
`= 34,5 xx 3 + 3,45 xx 7`
`= 3,45 xx 10`
`= 34,5`
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2,45 x 46 + 8 x 0,75 + 54 x 2,45 + 0,5 x 8
= 2,45 x ( 46 + 54 ) + 8 x ( 0,75 + 0,5 )
= 2,45 x 100 + 8 x 1,25
= 245 + 10
= 255
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a ) 3 , 45 x 10 = 34 , 5
2 , 17 x 100 = 217
5 , 38 x 1000 = 5380
b ) 34 , 5 x 0 , 1 = 3 , 45
21 , 7 x 0 , 01 = 0 , 217
53 , 8 x 0 , 001 = 0 , 0538
a) 3,45 x 10=34,5
2,17 x 100=217
5,38 x 1000=5380
b) 34,5 x 0,1=3.45
21,7 x 0,01=0,217
53,8 x 0,001=0,0538
34,5 \(\times\) 4,6 + 8 \(\times\)0,75 + 54 \(\times\) 3,45 + 5 \(\times\) 0,8
= (34,5 \(\times\) 4,6 + 54 \(\times\) 3,45) + ( 8 \(\times\) 0,75 + 5\(\times\) 0,8)
= (34,5 \(\times\) 4,6 + 5,4 \(\times\) 34,5 ) + ( 8 \(\times\) 0,75 + 8 \(\times\) 0,5)
= 34,5 \(\times\) ( 4,6 + 5,4) + 8 \(\times\) ( 0,75 + 0,5)
= 34,5 \(\times\) 10 + 8 \(\times\) 1,25
= 345 + 10
= 355