Question

[tongquangdung]

tinh nhanh

a]   {689+875}+125

b]   2/7+4/9+5/7+5/9

c]   581+878+419

d]   254x399-145/254+399x253

Answer 1

[doan ho thanh thao]

a)(689 + 875 ) +125

=1564 + 125

=2944

b)2/7 +4/9 +5/7 + 5/9 

=46/63 +80/63

=2

c)581 +878 +419

=(581 +419) +878

=1000+878

=1878

d)254 x 399 -145 /254 + 399 x 253

=399 x (254 +253 ) -145 /254

=399 x 507 -145 /254

=202292,4291

mik nha

Answer 2

[tongquangdung]

them mot cau nua nay

e]5932+6001x5931/5932x6001-69