方程题求速解答X/3/4=18 7/4X-4=1/5 X-1/5X=4/5

问题描述:

方程题求速解答
X/3/4=18 7/4X-4=1/5 X-1/5X=4/5

(1)X=216 (2)X=2.4 (3)X=1

(1)X=24(2)X=5/12(3)X=16/25

X/(3/4)=18 或 (X/3)/4=18、X/3=72、X=216
X=18×(3/4)
X=27/2=13.5
7/4X-4=1/5
(7/4)X=1/5+4=21/5
X=12/5=2.4
X-1/5X=4/5
(4/5)X=4/5
X=1