Question

tính hợp lí

a.12.25+29.25+59.25=

b.28.(231+69)+72.(231+69)=

c.49.27+51.27+27=

d.53.11

  79.101

Answer 1

a)25.(12+29+59)=25.100=2500

b)(231+69)(28+72)=300.100=30000

c)27(49+51)+27=27.100+27=2700+27=2727

d)là sao ko hiểu nếu là phân số bằng

583/7979

Answer 2

a. = 25.(12+29+59) = 25.100 = 2500

b. = 28.300 + 72.300 = 300.100 = 30000

c. = 27.(49+51+1) = 27.101 = 2727

d. 53.11 = 583

    79.101 = 7979

Answer 3

a,12*25+29*25+59*25

=25(12+29+59)

=25*100

=2500

b,28(231+69)+72(231+69)

=(231+69)(28+72)

=300*100

=30000

c,49*27+51*27+27

=27(49+51)+27

=27*100+27

=2700+27

=2727

d,53*11

=53*10+53*1

=530+53

=583

79*101

=79*100+79*1

=7900+79

=7979

Answer 4

a)12.25+29.25+59.25

=25.(12+29+59)

=25.100

=2500

b) 28.(231+69)+72.(231+69)

=  28 .    300    +72.300

=300.(28+72)

=300.100

=30000

c) 49.27+51.27+27

=27.(49+51)

=27.100

=2700

d)53.11=583

   79.101=7979