Question

Tính nhanh: 64x4+18x4+9x8=?

Answer 1

=32×8+9×8+9×8=8(32+9+9)=8×50=400

Answer 2

Ta có: \(64.4+18.4+9.8\)

\(=64.4+18.4+9.2.4\)

\(=64.4+18.4+18.4\)

\(=4.\left(64+18+18\right)=4.100=400\)

Ủng hộ nha?