Bài 1: a, -56+8.(11+7) b, 37.90-37.(-10) c, 47.(23+50)-23.(47+50) d, 29.(85-47)+85.(47-29) Các bn ơi giúp mk với mk đang cần gấp ạ

a. $(-56) + 8 × (11 + 7)$

$= (-56) + 8 × 18$

$= (-56) + 144$

$=  88$

b. $37 × 90 – 37 × (-10)$

$= 37 × [90 – (-10)]$

$= 37 × 100$

$= 3700$

c. $47 × (23 + 50) – 23 × (47 + 50)$

$= 47 × (23 + 50 – 23) + (-23) × 50$

$= 47 × 50 + (-23) × 50$

$= 50 × (47 – 23)$

$= 50 × 24$

$= 1200$

d. $29 × (85 – 47) + 8 × (47- 29)$

$= 29 × 85 + 29 × (-47) + 85 × (-29)$

$= 85 × (29 + 47 –  29) + 29 × (-47)$

$= 85 × 47 + (-29) × 47$

$= 47 × (85 – 29)$

$= 47 × (85 – 29)$

$= 47 × 56$

$= 2632$

– HỌC TỐT!