设铅笔x元,橡皮y元,卷笔刀z元,则有
(大括号)x+2y+3z=5.3
2x+3y+4z=7.7
3x+3y+5z=9.6
解得:(大括号)x=0.7
y=0.5
z=1.2
答:一支铅笔0.7元,一个橡皮0.5元,一个卷笔刀1.2元.
1支铅笔,2块橡皮,3个卷笔刀共花了5.3元,2支铅笔,3块橡皮,4个卷笔刀用了7.7元,3支铅笔,3块橡皮,5个
1支铅笔,2块橡皮,3个卷笔刀共花了5.3元,2支铅笔,3块橡皮,4个卷笔刀用了7.7元,3支铅笔,3块橡皮,5个
卷笔刀用了9.6元,问铅笔,橡皮,卷笔刀各多少元?
卷笔刀用了9.6元,问铅笔,橡皮,卷笔刀各多少元?
数学人气:756 ℃时间:2020-04-04 11:41:40
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