1.

A. 55,55+67,67+78,78

=5555 x 0,01+6767 x 0,01+7878 x 0,01

=0,01 x (5555+6767+7878)

=0,01 x 202000

B. 1997,1997+1998,1998+1999,1999

=19971997 x 0,0001+19981998 x 0,0001+19991999 x 0,0001

=0,0001 x (19971997+19981998+19991999)

=0,0001 x 59 945 994

132+77+198

=11 x 12+11 x 7+11 x 18

=11 x (12+7+18)

=11 x 37

5555+4747+6363

=55 x 101+47 x 101+63 x 101

=(55+47+63) x 101

=165 x 101

1997,1997+1998,1998+1999,1999

=1997 x 1,0001+1998 x 1,0001+1999 x 1,0001

=(1997+1998+1999) x 1,0001

=5994 x 1,0001

132 + 77 + 198

= 11 x 12 + 11 x 7 + 11 x 18

= 11 x (12 + 7 + 18)

= 11 x 37

5555 + 4747 + 6363

= 55 x 101 + 47 x 101 + 63 x 101

= 101 x (55 + 47 + 63)

= 101 x 165

1997,1997 + 1998,1998 + 1999,1999

= 1997 x 1,0001 + 1998 x 1,0001 + 1999 x 1,0001

= 1,0001 x (1997 + 1998 + 1999)

= 1,0001 x  5994

\(1997,1997+1998,1998+1999,1999=5994,5994\)

\(1997,1997+1998,1998+1999,1999=5994,5994\)

câu 1: 1997,1997+1998,1988+1999,1999=5994,5994

câu 2: 5932+6001x5931/5932x6001-69=360117932

tck mình nha

132 + 77 + 198

= 11 x 12 + 11 x 7 + 11 x 18

= 11 x (12 + 7 + 18) ( nhân 1 số với 1 tổng)

= 11 x 37

5555 + 6767 + 7878

= 55 x 101 + 67 x 101 + 78 x 101

= (55 + 67 + 78) x 101

= 200 x 101