Question

解下面的比例.1/2比1/5=1/4比X0.8比4=X比83/4比X=3比1236/X=54/32/9=8/X1.25比

Answer 1

①　1/2比1/5=1/4比X X = (1/5)×(1/4)÷(1/2) = 1/10

②　0.8比4=X比8 X = 8×0.8÷4 = 1.6

③　3/4比X=3比12 X = (3/4)×12÷3 = 3

④　36/X=54/3 X = (54/3)÷36 = 1/2

⑤　2/9=8/X X = 8×9÷2 = 36

⑥　1.25比0.25=X比1.6 X = 1.25×1.6÷0.25 = 8