X/3加6-x/4.2=3/2急解?

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[匿名]

2016-10-08 8:10 am

回答 (1)

螞蟻雄兵

2016-10-09 1:17 am

Sol
x/3+(6－x)/4.2=3/2
4.2*[ x/3+(6－x)/4.2]=4.2*3/2
1.4x+(6－x)=6.3
0.4x+6=6.3
0.4x=0.3
x=0.75

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