39 x 25 + 32 x 125
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a) \(125\times25\times8\times4\)
\(\Rightarrow\left(125\times8\right)\times\left(25\times4\right)\)
\(\Rightarrow1000\times100\)
\(\Rightarrow100000\)
101 \(\times\) 9,4 - 9,4 + 25 \(\times\) \(\dfrac{2,4}{250\%}\) \(\times\) 125% \(\times\) 32
= 9,4 \(\times\) ( 101 - 1) + 25 \(\times\) \(\dfrac{2,4}{2,5}\) \(\times\) 125% \(\times\) 8 \(\times\) 4
= 9,4 \(\times\)100 + 25 \(\times\) \(\dfrac{24}{25}\) \(\times\) 10 \(\times\) 4
= 94 \(\times\)10 + 24 \(\times\) 4 \(\times\) 10
= 10 \(\times\) ( 94 + 96)
= 10 \(\times\) 190
= 1900
\(25\times32\times125\times15\\=(25\times4)\times(8\times125)\times15\\=100\times1000\times15\\=100000\times15\\=1500000\)
25 x 32 x 125 x 15
=(125 x 32 ) x (25 x 15 )
= 4000 x 375
=1 500 000
\(\dfrac{31}{48}\times\dfrac{32}{93}\)
\(=\dfrac{31\times32}{48\times93}\)
\(=\dfrac{1\times2}{3\times3}\)
\(=\dfrac{2}{9}\)
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\(\dfrac{77}{80}\times\dfrac{48}{49}\)
\(=\dfrac{77\times48}{80\times49}\)
\(=\dfrac{11\times3}{5\times7}\)
\(=\dfrac{33}{35}\)
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\(\dfrac{154}{125}\times\dfrac{25}{44}\)
\(=\dfrac{154}{125}\times\dfrac{25}{44}\)
\(=\dfrac{7\times1}{5\times2}\)
\(=\dfrac{7}{10}\)
31x72 - 31x70 - 31 x 2 - 31
=31x(72 -70 -2 -1)
=31 x (-1)
= -31
những câu sau thì lam tương tự nha bạn ^_^
d, X/8*32+X/3*18-X/5*10=120
X*32/8+X*18/3-X*10/5=120
32X/8+18X/3-10X/5=120
4X+6X-2X=120
8X=120
X=120/8
X=15
a ) 2 x 3 x 5 x 7
= ( 2 x 5 ) x 3 x 7
= 10 x 21
= 210
b ) 50 x 9 x 9 x 2
= ( 50 x 2 ) x 9 x 9
= 100 x 81
= 8100
c ) 13 x 25 x 3 x 4
= ( 25 x 4 ) x 13 x 3
= 100 x 39
= 3900
d ) 7 x 125 x 7 x 8
= ( 125 x 8 ) x 7 x 7
= 1000 x 49
= 49000
e ) 25 x 32 x 125
= 800 x 125
= 100000
a) 92 : 0,01 = 9200 92 x 100 = 9200 64 : 0,01= 6400
b) 25 : 0,5 = 50 25 x 2 = 50 39 : 0,5 = 78
c) 32 : 0,25 = 128 32 x 4 = 128 15 : 0,25 = 60
39x25+32x125
=975+4000
=4975
39 x 25 + 32 x 125 = 975 + 4000 = 4975