解比例: X:40=2.5:4 1 14:X=0.4:8 X:3.5=40.5.
问题描述:
解比例:
X:40=2.5:4 1
14:X=0.4:8
X:3.5=40.5.
答
(1)x:40=2.5:4 1,
41x=40×2.5,
41x÷41=100÷41,
x=2
;18 41
(2)14:x=0.4:8,
0.4x=14×8,
0.4x÷0.4=112÷0.4,
x=280;
(3)x:3.5=40.5,
x=3.5×40.5,
x=141.75.