tính bằng cách thuận tiện nhất:14,5x89,55+2x9,45x7,25+14,5
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13, 25 : 0. 125 + 13. 25 : 0. 25 - 13. 25 : 0. 5
= 13. 25 . 8 + 13. 25 . 4 - 13, 25 . 2
= 13, 25( 8 + 4 - 2 )
= 13, 25 . 10
= 132, 5
`29 xx 20,22 + 15 xx 20,22 + 20,22 xx 44 + 24 xx 10,11`
`= 20,22 xx (29 + 15 + 44 + 12)`
`= 20,22 xx 100`
`= 2022`
= ( 2380 + 9 x 480) : 25 - 3500 : 25
= ( 2380 + 4320 - 3500 ) : 25
= 3200 : 25
= 128
\(x\times\left(0,1+4+2,9+2+1\right)=25,2\)
\(10x=25,2\)
\(x=2,52\)
\(x\times0,1+x\times4+x\times2,9+x\times2+x=25,2\)
\(x\times\left(0,1+4+2,9+2+1\right)=25,2\)
\(x\times10=25,2\)
\(x=25,2:10\)
\(x=2,52\)
tìm x mè giải thích sao :v?
a, \(13\) \(\times\) 15 - 150 + 97 \(\times\) 15
= 15 \(\times\) ( 13 - 10 + 97)
= 15 \(\times\) ( 3 + 97)
= 15 \(\times\) 100
= 1500
b, \(\dfrac{2016}{2015}\) \(\times\) \(\dfrac{4}{7}\) - \(\dfrac{4}{7}\) \(\times\) \(\dfrac{1}{2015}\) + \(\dfrac{3}{7}\)
= \(\dfrac{4}{7}\) \(\times\) ( \(\dfrac{2016}{2015}\) - \(\dfrac{1}{2015}\)) + \(\dfrac{3}{7}\)
= \(\dfrac{4}{7}\) \(\times\) \(\dfrac{2015}{2015}\) + \(\dfrac{3}{7}\)
= \(\dfrac{4}{7}\) + \(\dfrac{3}{7}\)
= \(\dfrac{7}{7}\)
= 1
a, 13 \(\times\) 15 - 150 + 97 \(\times\)15
13 \(\times\) 15 - 15 \(\times\) 10 + 97 \(\times\) 15
= 15 \(\times\) ( 13 - 10 + 97)
= 15 \(\times\) ( 3 + 97)
= 15 \(\times\) 100
=1500
b, \(\dfrac{2016}{2015}\) \(\times\) \(\dfrac{4}{7}\) - \(\dfrac{4}{7}\) \(\times\) \(\dfrac{1}{2015}\) + \(\dfrac{3}{7}\)
= \(\dfrac{4}{7}\) \(\times\) ( \(\dfrac{2016}{2015}\) - \(\dfrac{1}{2015}\)) + \(\dfrac{3}{7}\)
= \(\dfrac{4}{7}\) \(\times\) \(\dfrac{2015}{2015}\) + \(\dfrac{3}{7}\)
= \(\dfrac{4}{7}\) + \(\dfrac{3}{7}\)
= \(\dfrac{7}{7}\)
= 1
\(\dfrac{3}{5}\times\dfrac{2}{7}-\dfrac{3}{5}\times\dfrac{4}{7} +\dfrac{3}{5}\)
\(=\dfrac{3}{5}\times\left(1+\dfrac{2}{7}-\dfrac{4}{7}\right)\)
\(=\dfrac{3}{5}\times\left(\dfrac{7}{7}+\dfrac{2}{7}-\dfrac{4}{7}\right)\)
\(=\dfrac{3}{5}\times\left(\dfrac{7+2-4}{7}\right)\)
\(=\dfrac{3}{5}\times\dfrac{5}{7}\)
\(=\dfrac{3}{7}\)
= 3/5 x 2/7 - 3/5 x 4/7 + 3/5 x 1
= 3/5 x ( 2/7 + 4/7 + 1 )
= 3/5 x 1
= 3/5
a) \(2,4:0,25+5,6:4+2\times\frac{1}{4}\)
\(=2,4\times\frac{1}{4}+5,6\times\frac{1}{4}+2\times\frac{1}{4}\)
\(=\left(2,4+5,6+2\right)\times\frac{1}{4}\)
\(=10\times\frac{1}{4}=\frac{5}{2}\)
b)\(3,47\times\frac{1}{2}-2,47:2+0,5\)
\(=3,47\times\frac{1}{2}-2,47\times\frac{1}{2}+\frac{1}{2}\times1\)
\(=\left(3,47-2,47+1\right)\times\frac{1}{2}\)
\(=2\times\frac{1}{2}=1\)
#Y/n
14,5 x 89,55 +2 x 9,45 x 7,25 + 14,5
= 14,5 x 89,55 + 2 x 7,25 x 9,45 + 14,5 x 1
= 14,5 x 89,55 + 14,5 x 9,45 + 14,5 x 1
= 14,5 x ( 89,55 + 9,45 + 1 )
= 14,5 x 100
= 1450
~ HOK TỐT ~