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(456x11+912)x37:13x74
= (5016+912)x37:13x74
= 5928 x37:13x74
= 219336 :13x74
= 16872 x74
= 1248528.
K nhé
\(\left(456\times11+912\right)\times37:13\times74\)
\(=\left(5016+912\right)\times37:13\times74\)
\(=5928\times37:13\times74\)
\(=219336:13\times74\)
\(=16872\times74\)
\(=1248528\)
3 giờ 25 phút \(\times\) 7 = 21 giờ 175 phút = 23 giờ 55 phút
4 giờ 6 phút \(\times\) 8 =32 giờ 48 phút
#Sahara |
3 giờ 25 phút ×× 7 = 21 giờ 175 phút = 23 giờ 55 phút
4 giờ 6 phút ×× 8 =32 giờ 48 phút
\(\dfrac{1}{12}\times\dfrac{4}{5}=\dfrac{4}{60}=\dfrac{1}{15}\\ \dfrac{9}{5}:\dfrac{4}{7}=\dfrac{9}{5}\times\dfrac{7}{4}=\dfrac{63}{20}\\ 4\times\dfrac{3}{7}=\dfrac{4\times3}{7}=\dfrac{12}{7}\\ \dfrac{1}{2}:5=\dfrac{1}{2}\times\dfrac{1}{5}=\dfrac{1}{10}\)
2010 x 2010 - 2009 x 2011
= ( 2011 - 2010 ) x 2010 - 2009 x 2011
= 2011 x 2010 - 1 x 2010 - 2009 x 2011
= 2011 x ( 2010 - 2009 ) - 1 x 2010
= 2011 x 1 - 2010
= 2011 - 2010
= 1
( 456 x 11 + 912 ) x 37 : ( 13 x 74 )
= ( 456 x 11 + 456 x 2 ) x 37 : ( 13 x 74 )
= [ 456 x ( 11 + 2 ) ] x 37 : ( 13 x 74 )
= [ 456 x 13 ] x 37 : ( 13 x 74 )
= 13 x 456 x 37 : ( 13 x 37 x 2 )
= 13 x 37 x 2 x 228 : ( 13 x 37 x 2 )
= ( 13 x 37 x 2 ) x 228 : ( 13 x 37 x 2 )
= ( 13 x 37 x 2 ) : ( 13 x 37 x 2 ) x 228
= 1 x 228
= 228
(44 x 52 x 60) : (11 x13 x 15 )
= [ ( 4 x 11 ) x ( 4 x 13 ) x ( 4 x 15 ) ] : (11 x13 x 15 )
= [ 4 x 11 x 4 x 13 x 4 x 15 ] : (11 x13 x 15 )
= [ ( 4 x 4 x 4 ) x ( 11 x 13 x 15 ) ] : (11 x13 x 15 )
= 64 x (11 x13 x 15 ) : (11 x13 x 15 )
= 64 x 1
= 64
a) 2010 x 2010 - 2009 x 2011
= 2010 x 2010 - [ 2009 x ( 2010 +1) ]
=2010 x 2010 - 2009 x 2010 - 2009
=2010( 2010 - 2009 ) -2009
= 2010 -2019
= 1
c) ( 44 x 52 x60 ) : (11x13x15)
\(\frac{44\cdot52\cdot60}{11\cdot13\cdot15}=\frac{4\cdot11\cdot4\cdot13\cdot4\cdot15}{11\cdot13\cdot15}=64\)
B) (456 x 11 +912) x 37 : ( 13 x 74 )
= \(\frac{\left(456\cdot11+912\right)\cdot37}{13\cdot74}=\frac{\left[456\left(11+2\right)\right]\cdot37}{13\cdot37}=\frac{456\cdot13}{13\cdot2}=\frac{456}{2}=228\)
Nhớ k mik nha bn
\(19\dfrac{1}{4}\text{+}\dfrac{1}{2}.2\dfrac{1}{3}\text{+}5,75-\dfrac{1}{6}\text{+}74\)
=\(\dfrac{77}{4}\text{+}\dfrac{1}{2}.\dfrac{7}{3}\text{+}\dfrac{23}{4}-\dfrac{1}{6}\text{+}74\)
=\(\dfrac{77}{4}\text{+}\dfrac{23}{4}\text{+}\dfrac{7}{6}-\dfrac{1}{6}\text{+}74\)
=\(25\text{+}1\text{+}74\)
=\(100\)
2019 x 74+ 2019 x 25 + 2019
2019 x 74 + 2019 x 25 + 2019 x 1
2019 x (74 + 25 + 1)
2019 x 100
= 201900
74 * 11 - 74 * { 6 + 3 + 1}
= 74 * 11 - 74 * 10
= 74 * { 11 -10}
= 74 *1 = 74
74 x 11 - ( 74 x 6 + 74 x 3 + 74 )
= 814 - 74 x ( 6 + 3 + 1 )
= 814 - 74 x 10
= 814 - 740
=74
ai tk mk mk tk lại