*19x64+76x34=
19x64x19x4x34
19x64x19x136
19x(64+136)
19x200
3800
* 136x68+16x272=
136x68+16x2x136
136x68+32x136
136x(68+136)
136x200
27200
Giải
19 x 64 + 76 x 34 = 19 x 64
= 1216
= 1216 + ( 76 x 34 )
= 1216 + 2584
= 3800.
Câu 2 : Giải
136 x 68 + 16 x 272 = 136 x 68
= 9248
= 9248 + ( 16 x 272 )
= 9248 + 4352
= 13600.