-63.(-78) + 78.(-153) 

=-63.(-78)+(-78).153

=(-78).(-63+153)

=(-78).90

=-7020

esdyhbjm,gnv,gggggggggggggggggggggggggggggggggg

\(58+69+25+63+78=293\)

mk nhanh nhất

58+69+25+63+78=293

58 +69 +25 + 63 + 78 = 293

Ta có : 78/91 : 63/79 = 158/147 . Vì 158/147 > 1 => 78/91 > 63/79

a: =100x26=2600

b: =78x10=780

c: =67x100=6700

d: =1000x575=575000

\(4\times26\times25=\left(4\times25\right)\times26=100\times26=2600\\ 63\times78-53\times78=\left(63-53\right)\times78=10\times78=780\\ 67\times92+67\times8=67\times\left(92+8\right)=67\times100=6700\\ 8\times23\times25\times125=\left(8\times125\right)\times\left(23\times25\right)=1000\times575=57500\)

a: =100x26=2600

b: =78x10=780

c: =67x100=6700

d: =1000x575=575000

a, 78 443 - 426 x63 

= 78 443  - 26 838

=     51 605

b, 23 746 x 35 502

 =    843 030 492

a, 78 443 - 426 x 63 = 78 443 - 26 838 = 51 605

b, 23 746 x 35 502 = 843 030 492

Mình có moitj chút nhầm lẫn ý b 

 b, 23 746 + 3550 : 25

Hướng dẫn giải:

a) 4 x 78 x 5 = (4 x 5) x 78 = 20 x 78 = 1560

b) 2 x 99 x 5 = (2 x 5) x 99 = 10 x 99 = 990

c) 6 x 31 x 5 = (6 x 5) x 31 = 30 x 31 = 930

d) 8 x 63 x 5 = (8 x 5) x 63 = 40 x 63 = 2520

Câu 1: 142 . 48 - 84 - 28

= 6816 - 84 - 28

= 6732 - 28

= 6704

Câu 2: 79 . 37 + 78 . 63

= 2923 + 4914

= 7837