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k) 4 x 113 x 25 - 5 x 112 x 20
= (4 x 25) x 113 - (5 x 20) x 112
= 100 x 113 - 100 x 112
= 100 x (113 - 112)
= 100
p) 1235 x 6789 x (630 - 315 x 2) : 1996
= 1235 x 6789 x (630 - 630) : 1996
= 1235 x 6789 x 0 : 1996
= 0
l) 54 x 113 + 45 x 113 + 113
= 113 (54 + 45 + 1)
= 113 x 100
= 11300
u) (500 x 9 - 250 x 18) x (1 + 2 + 3 + ... + 9)
= (2 x 250 x 9 - 250 x 2 x 9) x (1 +2 + 3 + ... + 9)
= 0 x (1 + 2 + 3 + ... + 9)
= 0
\(1235\text{×}6789\text{×}\left(630-315\text{×}2\right)\)
\(=1235\text{×}6789\text{×}\left(630-630\right)\)
\(=1235\text{×}6789\text{×}0=0\)
\(\left(100+67\right)\text{×}67+\left(200-38\right)\text{×}33\)
\(=167\text{×}67+167\text{×}33\)
\(=167\text{×}\left(67+33\right)\)
\(=167\text{×}100=16700\)
\(72+36\text{×}2+24\text{×}3+18\text{×}4+12\text{×}2+168\)
\(=72+72+72+72+24+168\)
\(=\left(72\text{×}4\right)+24+168=288+24+168=480\)
`23xx315+11xx315+33xx630`
`=23xx315+11xx315+66xx315`
`=315xx(23+11+66)`
`=315xx100`
`=31500`
a, 17,58 x 43 + 57 x 17,58
= 17,58 x 43 + 17,58 x 57 (tính giao hoán)
= 17,58 x (43 + 57) = 17,58 x 100 = 1758 (nhân 1 số với 1 tổng)
b, 43,57 x 2,6 x (630 – 315 x 2)
= 43,57 x 2,6 x (630 – 630)
= 43,57 x 2,6 x 0 = 0
TICK CHO MÌNH NHA
Giải:
326 x 728 + 327 x 272
= 326 x 728 + 326 x 272 + 272
= 326 x ( 728 +272 ) +272
= 326 x 1000 + 272
= 326 000 +272
= 326 272
TICK CHO MÌNH NHA
Giải:
2008 x 867 +2009 x 133
= 2008 x 867 + 2008 x 133 +133
= 2008 x ( 867 + 133) +133
= 2008 x 1000 +133
= 2 008 000 + 133
= 2 008 133
a, 132 x 99 + 132
= 132 x 99 + 132 x 1
= 132 x ( 99 + 1 )
= 132 x 100 = 13200
b, ( 56 x 27 + 56 x 35 ) : 62
= 56 x ( 27 + 35 ) : 62
= 56 x 62 : 62
= 62 : 62 x 56
= 1 x 56 = 56
c, 2015 x ( 67 + 53 ) - 2005 x ( 53 + 67 )
= 2005 + 10 x 120 - 2005 x 120
= 2005 x 120 - 2005 x 120 + 10
= 2005 x ( 120 - 120 ) + 10
= 2005 x 0 + 10
= 0 + 10 = 10
d, 2009 x 2009 - 2010 x 2008
= 2009 x 2009 - 2009 x 2009
= 2009 x ( 2009 - 2009 )
= 2009 x 0
= 0
e, 4357 x 267 x ( 630 - 315 x 2 )
= 4357 x 267 x ( 630 - 630 )
= 4357 x 267 x 0
= 4357 x 0
= 0
a. 132 x 99 + 132
= 132 x (99 + 1)
= 132 x 100
= 13200
b. (56 x 27 + 56 x 35) : 62
= 56 x (27 + 35) : 62
= 56 x 62 : 62
= 56
c. 2015 x (67 + 53) - 2005 x (53 + 67)
= (2015 - 2005) x (67 + 53)
= 2010 x 120
= 241200
\(\frac{4}{9}+\frac{1}{18}+\frac{3}{18}=\frac{4}{9}+\left(\frac{1}{18}+\frac{3}{18}\right)=\frac{4}{9}+\frac{2}{9}=\frac{2}{3}\)
4/9 + 1/18 + 3/18
(1/18 + 3/18) + 4/9
2/9 + 4/9
6/3 =2/3
( 45 x 46 + 47 x48 ) x (51 x52 -48 x49 ) x ( 45 x 125 -90 x 64)
4326 x 300 x 0
0 x 4326 x 300
0 x 300
vì trong phép nhân có tính chất giao hoán
1234 x 5678 x ( 630 - 315 x2 ) x1996
1234 x5678 x 0 x 1996
0 x 1234 x 5678 x 1996
0 x 5678 x 1996
0 x 1996
0
a/=17,58x(43+57)
=17,58x100
=1758
b/=43,57x2,6x(630-630)
=43,57x2,6x0
=0
\(17,58\times43+57\times17,58\)
\(=17,58\times\left(43+57\right)\)
\(=17,58\times100=1758\)
\(43,57\times2,6\times\left(630-315\times2\right)\)
\(=43,57\times2,6\times0\)
\(=0\)
1235×9–2470×2+1235×5
=1235×9–1235×2×2+1235×5
=1235×9–1235×4+1235×5
=1235×(9−4+5)
=1235×10
=12350
\(1235\cdot6789\cdot\left(630-315\cdot2\right):1996\)
\(=1235\cdot6789\left(630-630\right):1996\)
=0