Question

[Son Goku]

Tính nhanh:
                                      a). 125 x 12 + 12 x 874 + 12
                                      b). 34,64 x 46 + 34,64 x 53 + 34,64
                                      c). 456 x 45 + 456 x 10 – 456 x 55
                                      d).1475+399-475-199
                          

Answer 1

[Nguyễn Việt Hoàng]

 a). 125 x 12 + 12 x 874 + 12

 = 12 x (125 + 874 + 1)

 = 12 x 1000

=12 000

Answer 2

[VRKT_Hạ in Home]

mink chỉ bít câu a) thôi nha

12 x ( 125 + 874 ) = 12 x 999 

                             = 11988