( 11 + 19) + ( 12 + 18 ) + (13 +17 ) + (14 + 16 ) + 15 = 30 + 30 + 30 + 30 + 15 = 30 x 4 + 15=120 + 15 = 135
(19+11)+(12+18)+(17+13)+(16+14)+15
=30+30+30+30+15
=30x4+15
=120+15
=135
(11 + 19) + (12 + 18) + (13 + 17) + (14 + 16) + 15 = 30 + 30 + 30 + 30 + 15 = 30 * 4 + 15 = 120 +15 =135
[11+19]+[12+18]+[13+17]+[14+16]+15
= [30 + 30 + 30 + 30] + 15
= 120 +15
= 135
(19+11)+(12+18)+(17+13)+(16+14)+15
=30+30+30+30+15
=30x4+15
=120+15
=135
= (11 + 19) + (12 + 18) + (13 + 17) + (14 + 16) + 15
= 30 x 4 + 15
= 120 + 15
= 135
11+12+13+14+15+16+17+18+19
=(11+19)+(12+18)+(13+17)+14+16)+15
=30+30+30+30+15
=30x4+15
=120+15
=135
Ta có:11+12+13+14+15+16+17+18+19
=(11+19)+(12+18)+(13+17)+(14+16)+15
=30+30+30+30+15
=30*4+15
=120+15
=135
(11+19)+(12+18)+(13+17)+(14+16)+15=30+30+30+30+15=135
( 11 + 19 ) + ( 12 + 18 ) + ( 17 + 13 ) + ( 16 + 14 ) + 15
= 30 + 30 + 30 + 30 + 15
= 30 x 4 + 15
= 120 + 15
= 135
= (11 + 19) + (12 + 18) + (13 + 17) + (14 + 16) + 15
= 30 + 30 + 30 + 30 + 15
= 120 + 15
= 135
11 + 12 + 13+ 14 + 15 + 16 + 17 + 18 + 19
= ( 11 + 19 ) + ( 12 + 18 ) + ( 13 + 17 ) + ( 14 + 16 ) + 15
= 30 + 30 + 30 + 30 + 15
= 155
(11 + 19) + (12 + 18) + ( 13 + 17) + (14 + 16) + 15
= 30 + 30 + 30 + 30 + 15
= 30 x 4 +15
= 120 +15
=135
(11+19)+(12+18)+(13+17)+(14+16)+15
20+20+20+20+15
115
[11+19]+[12+18]+[13+17]+[14+16]+15
= 30 + 30 + 30 + 30 +15
=135
(11+19)+(12+18)+(13+17)+(14+16)+15
=(30+30+30+30)+15
=(30*4)+15
=120+15
=135
11+12+13+14+15+16+17+18+19
=(11+19)+(12+18)+(13+17)+(14+16)+15
=30+30+30+30+15
=30x4+15
=120+15
=135
11+12+13+14+15+16+17+18+19
=[11+19]+[12+18]+[13+17]+[14+16]+15
= 30 + 30 + 30 + 30 + 15
= 135
=(11+19)+(18+12)+(17+13)+(16+14)+15
=30 + 30 + 30 +30 +15
=30x4 +15
=135
(11+19)+(12+18)+(13+17)+(14+16)+15
=30+30+30+30+15
=30x4+15
=120+15
=135
[11+19]+[12+18]+[13+17]+[14+16]+15= 30+30+30+30+15=120+15=135
=(11+19)+(12+18)+(13+17)+(14+16)+15
=30+30+30+30+15
=30*4+15
=120+15
=135
= (11 + 19 ) + (12+ 18) + (13 + 17) + (14 + 16) + 15
= 30 + 30 + 30 + 30 + 15
= 135
\(11+12+13+14+15+16+17+18+19.\)
\(=\left(11+19\right)+\left(12+18\right)+\left(13+17\right)+\left(14+16\right)+15\)
\(=20+20+20+20+15\)
\(=20.4+15\)
\(=80+15\)
\(=95\)
( 11+19 ) + (12+18 ) + (13+17) + (14+16) +15 = 30 + 30 + 30 + 30 + 15 = 30 x 4 + 15 = 120 + 15 = 135
11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19
=( 11+19 ) + ( 12+ 18 ) + ( 13+17) + ( 14+ 16) +15
=30 + 30 + 30 + 30 + 15
=30 x 4 + 15
= 120 + 15
= 135
11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19
= ( 11 + 19 ) + ( 12 + 18 ) + ( 13 + 17 ) + ( 14 + 16 ) + 15
= 30 + 30 + 30 + 30 + 15
= 30 x 4 + 15
= 120 + 15
= 135
Chúc bạn học tốt!
( 11+19 )+(12+18)+(13+17)+(14+16)+15
=30+30+30+30+15=30*4+15=120+15=135
(11+19)+(12+18)+(13+17)+(14+16)+15
=30+30+30+30+15
=30*4+15
=120+15
=135