17x8+51x4 = 17x8+17x3x4= 17x8+17x12= 17x(8+12) = 17x20=340
17 x 8 + 51 x 4
=17 x 8 + 17 x 3 x 4
=17 x 8 + 17 x 12
=17 x ( 8 + 12 )
= 17 x 20
=340
Toán lp 4 p ạ
17 x 8 + 51 x 4
= 17 x 8 + 17 x 3 x 4
= 17 x ( 8 + 3 x 4 )
= 17 x ( 8 + 12 )
= 17 x 20
= 340 .