15.(27+18+6)+15.(23+12)
=15.(27+18+6+23+12)
=15.[(27+23)+(18+12)+6]
=15.(50+30+6)
=15.86
=1290
15 × ( 27 + 18 + 6 ) + 15 × ( 23 + 12)
= 15 × 51 + 15 × 35
= 15 × 51 +35
= 15 × 86
= 1290
Ta có
15 × ( 27 + 18 + 6 ) + 15 × ( 23 + 12)
= 15 × 51 + 15 × 35
= 15 × 51 +35
= 15 × 86
= 1290
hok tốt
= 15 x 51 + 15 x 35
= 15 x ( 51 + 35 )
= 15 x 86
= 1290
cứt đầu buồi♠♣♥haha