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\(50\times45\times2\)
\(=100\times45\)
\(=4500\)
\(78\times2\times5\)
\(=78\times10\)
\(=780\)
50 x 45 x 2
= 45 x ( 50 x 2 )
= 45 x 100 = 4500
78 x 2 x 5
= 78 x ( 2 x 5 )
= 78 x 10 = 780
a) 96 + 78 + 4 = 96 + 4 + 78 = 100 + 78 = 178
67 + 21 + 79 = 67 + 100 = 167
408 + 85 + 92 = 405 + 92 + 85 = 500 + 85 = 585
b) 789 + 285 + 15 = 789 + 300 = 1089
448 + 594 + 52 = 448 + 52 + 594 = 500 + 594 = 1094
677 + 969 + 123 = 677 + 123 + 969 = 1769
a) 96 + 78 + 4 = 96 + 4 + 78 = 100 + 78 = 178
67 + 21 + 79 = 67 + 100 = 167
408 + 85 + 92 = 405 + 92 + 85 = 500 + 85 = 585
b) 789 + 285 + 15 = 789 + 300 = 1089
448 + 594 + 52 = 448 + 52 + 594 = 500 + 594 = 1094
677 + 969 + 123 = 677 + 123 + 969 = 1769
78+78x3+39x12
= 78+78x3+39x2x6
=78+78x3+78x6
= 78 x (1 +3 +6)
= 78 x 10
= 780
=78 + 78 x 3 + 39 x 2 x 6
= 78+ 78 x 3 + 78 x 6
= 78 x (1+3+6)
= 78 x 10 = 780
k mk nha
192.78+192.21+8492
=192(78+21)+8492
=192.100+8492
=19200+8492
=27692
\(192\times78+192\times21+8492\)
\(=192\times\left(78+21\right)+8492\)
\(=192\times99+8492\)
\(=192\times\left(100-1\right)+8492\)
\(=192\times100-192\times1+8492\)
\(=19200-192+8492\)
\(=19200+8300\)
\(=27500\)
192 x 78 + 192 x 21 + 8492
= 192 x ( 78 + 21 ) + 8492
= 192 x 100 + 8492
= 19200 + 8492
= 27692
192 x 78 + 192 x 21 + 8492
= 192 x 78 + 192 x 21 + 192 x 1 + 8300
= 192 x ( 78 + 21 +1 ) + 8300
= 192 x 100 + 8300
= 19200 + 8300
= 27500
_HT_
a: =100x26=2600
b: =78x10=780
c: =67x100=6700
d: =1000x575=575000
\(4\times26\times25=\left(4\times25\right)\times26=100\times26=2600\\ 63\times78-53\times78=\left(63-53\right)\times78=10\times78=780\\ 67\times92+67\times8=67\times\left(92+8\right)=67\times100=6700\\ 8\times23\times25\times125=\left(8\times125\right)\times\left(23\times25\right)=1000\times575=57500\)
= ( 11 + 89 ) + ( 22 + 78 ) + ( 33 + 67 ) + ( 44 + 56 ) + 55
= 100 + 100 + 100 + 100 + 55
= 400 + 55
= 455
HT
phuonglebao9@gmail.com
=<89+11>+<78+22>+<67+33>+<56+44>+55
=100+100+100+100+55
=400+55
=455
78 x 15 + 78 x 85
= 78 x ( 85 + 15)
= 78 x 100
= 7800