cậu bảo tôi tính thuận tiện làm sao? 76 + 14 = 90 nhé

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

\(=25,17\times\left(16,9-16,8\right)\\ =25,17\times1=25,17\)

25,17 x 16,9 - 25,17 x 16,8 

= 25,17 x ( 16,9 - 16,8 )

= 25,17 x 0,1

= 2,517

25,17 x 16,9 - 25,17 x 16,8

=25.17 x(16.9 - 16.8)

=25.17 x 0.1

=2.517

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

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

`=28/14+54/18`

`=2+3`

`=5`

\(g,\\ \dfrac{5:0,25\times7:0,5}{20\times14}=\dfrac{5\times4\times7\times2}{20\times14}=\dfrac{20\times14}{20\times14}=1\)

\(h\\ 69,78+35,97+30,22\\ =\left(69,78+30,22\right)+35,97=100+35,97=135,97\)

34,7 : 0,25 + 65,3 x 4

=34,7 x 4 + 65,3 x 4

=4x\(\left(34,7+65,3\right)\)

=4 x 100 = 400