Tham khảo:
75/100 + 3/4 x 29 + 75% x 30 + 0,75 x 40
= 0,75 + 0,75 x 29 + 0,75 x 30 + 0,75 x 40
= 0,75 x (1 + 29 + 30 + 40)
= 0,75 x 100
= 75
\(\dfrac{75}{100}+\dfrac{3}{4}x29+75\%x30+0,75x40=\dfrac{3}{4}+\dfrac{87}{4}+\dfrac{90}{4}+\dfrac{120}{4}=75\)