`#` ` tcv `
Bài `4` :
(145 x 99 + 145 ) - ( 143 x 102 – 143 × 2 ) + 54 x 47 - 47 x 53 - 20 - 27
= (145x99+145x1)-(143x102-143x2)+54 x 47 - 47 x 53-(20+27)
= (145x99+145x1)-(143x102-143x2)+54 x 47 - 47 x 53-47x1
= 145 × 100 – 143 × 100 + 47x(54-53-1)
= 100x(145-143)+47x0
= 200
`------------`
= 3381x3+6x573x4
= 10143+13728
= 2387