方程题求速解答X/3/4=18 7/4X-4=1/5 X-1/5X=4/5

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方程题求速解答X/3/4=187/4X-4=1/5X-1/5X=4/5方程题求速解答X/3/4=187/4X-4=1/5X-1/5X=4/5方程题求速解答X/3/4=187/4X-4=1/5X-1/5

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

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

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

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