27 × 76 + 24 × 76 + 260

= 76×(27 + 24) + 260

= 4060

32 × 47 + 32 × 53

= 32×(47 + 53)

= 3200

27 ×31 + 31 ×73

= 31×(27 + 73)

= 3100

69 ×54 + 69 × 46

= 69×(54 + 46)

= 6900

20 × 64 + 36 ×20 + 19

= 20×(64 + 36) + 19

= 2019

123 ×75 + 25 × 23 + 180

= 23×(75 + 25) + 180

= 2480

@Sad2006

a) 27 xx 76 + 24 xx 76 + 260

= 76 xx (27 + 24) + 260

= 76 xx 50 + 260

= 3800 + 260

= 4060

b) 32 xx 47 + 32 xx 53

= 32 xx (47 + 53)

= 32 xx 100

= 3200

c) 27 xx 31 + 31 xx 73

= 31 xx (27 + 73)

= 31 xx 100

= 3100

d ) 69 xx 54 + 69 xx 46

= 69 xx (54 + 46)

= 69 xx 100

= 6900

e) 20 xx 64 + 36 xx 20 + 19

= 20 xx (64 + 36) + 19

= 20 xx 100 + 19

= 2000 + 19

= 2019

f) 23 xx 75 + 25 xx 23 + 180

= 23 xx (75 + 25) + 180

= 23 xx 100 + 180

= 2300 + 180

= 2480

# $$khoinguyentien$$