Toán Lớp 4: 2) Tính nhanh: A)12 x 123 + 3 x 4567 x 4 + 6 x 5310 x 2

Question

Toán Lớp 4:  2) Tính nhanh:                                                    A)12 x 123 + 3 x 4567 x 4 + 6 x 5310 x 2                                                                                                                                                                                              B) 36 x 47 + 63 x 47 + 47                                                                                                                                                                                                                             C)125 x 36 + 250 x 32                                                                                                                                                                                     D) 204 x 453 + 547 x 204

thanhthuythu · Answer

Giải đáp + giải th&iacute;ch c&aacute;c bước giải:   a, 12 xx 123 + 3 xx 4567 xx 4 + 6 xx 5310 xx 2    = 12 xx 123 + 12 xx 4567 + 12 xx 5310    = 12 xx (123 + 4567 + 5310)    = 12 xx 10000    = 120000   b, 36 xx 47 + 63 xx 47 + 47    = 47 xx (36 + 63 + 1)    = 47 xx 100    = 4700   c, 125 xx 36 + 250 xx 32    = 125 xx 36 + 125 xx 2 xx 32    = 125 xx 36 + 125 xx 64    = 125 xx (36 + 64)    = 125 xx 100    = 12500   d, 204 xx 453 + 547 xx 204    = 204 xx (453 + 547)    = 204 xx 1000    = 204000

cobebongdem · Answer

a)12xx123+3xx4567xx4+6xx5310xx2   =12xx123+12xx4567+12xx5310   =12xx(123+4565310)   =12xx10000   =120000   b)36xx47+63xx47+47   =36xx47+63xx47+1xx47   =47xx(36+63+1)   =47xx100   =4700   c)125xx36+250xx32   =125xx36+125xx2xx32   =125xx36+125xx64   =125xx(36+64)   =125xx100   =12500   d)204xx453+547xx204   =204xx(453+547)   =204xx1000   =204000