90.18+14.118+118.76

=90.18+118.(14+76)

=90.18+118.90

=90.(18+118)

=90.136

=12240

90.18+(14.118+118.76)

=90.18+118(14+76)

=90.18+118.90

=90.(18+118)

=90.136

=12240

 = 90.18 + 118.(14+76)  =90.(18 +118)  = 90.136 = 12240

382+254+246+118

=(382+118)+(254+246)

=500+500

=1000

(382+118)+(254+246)

=500+500

=1000

=(382 + 118) + (254 + 246)

=500 + 500

=1000

a) 18 + 15 + 22 + 45 = ( 18 + 22 ) + ( 15 + 45 ) = 40 + 60 = 100 

b) 276 + 118 + 324 = ( 276 + 314 ) + 118 = 590 + 118 = 708 

c) 5 . 9 . 3 . 2 = ( 5 . 2 ) . 9 . 3 = 10 . 27 = 270 

d) 25 . 5 . 4 . 27 . 2 = ( 25 . 4 ) . ( 5 . 2 ) . 27 = 100 . 10 . 27 = 27000 

nha bn chúc bn học giỏi

a)18+15+22+45 = (18 + 22) + (45 + 15 )= 40 +60 = 100

b)276+118+324 =(276 + 324 ) + 118= 600 +118= 7118

c)5.9.3.2 = ( 5. 2 ). (9 . 3 ) = 10 . 27 = 270

d)25.5.4.27.2 = (25. 4 ) . ( 5 . 2 ) . 27 = 100 . 10 . 27 = 1000.27 = 27 000 

k mình nha

-- h cua mot so voi so 0 thi bang......

-- Neu h cua hai thua so ma bang 0 thi co it nhat mot thua so bang .......

giup mik cai nha..cam on cac ban

=12240

`9/14+19/18+19/14+35/18`

`=(9/14+19/14)+(19/18+35/18)`

`=28/14+54/18`

`=2+3`

`=5`

2020*14+4040*16+6060*18

= 1010*2*14+1010*4*16+1010*6*18

=1010*28+1010*64+1010*108

=1010*(28+64+108)

=1010*200=202000

= 2020 * 14 + 2020 * 2 * 16 + 2020 * 3 * 18

= 2020 * 14 + 2020 * 32 + 2020 * 54

=2020 * (14 + 32 + 54)

=2020 * 100

=20200

cảm ơn bạn. bạn có thể giúp mình thêm 1 bài ko?

Số số hạng là 19-11+1=9(số)

Tổng là: 10x9=90

=(11+19)+(12+18)+(13+17)+(14+16)+15

=30+30+30+30+15

=135

90