一个杯子两个饭盒共30元,两个水杯一个饭盒共24元,一个水杯和一个饭盒各多少元 理工学科有哪些
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\u5316\u5b66
\u6570\u5b66
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\u7406\u5de5\u5b66\u79d1\u5305\u62ec
\u6570\u5b66
\u7269\u7406\u5b66
\u5316\u5b66
\u751f\u7269\u5b66
\u5929\u6587\u5b66
\u5fc3\u7406\u5b66
\u5730\u7403\u79d1\u5b66
\u519c\u4e1a\u79d1\u5b66
\u73af\u5883\u5b66
\u751f\u6001\u5b66
\u5de5\u7a0b\u6280\u672f\u79d1\u5b66
\u5efa\u7b51\u5b66
......
杯子6块。饭盒12
18
x+2y＝30
2x＋y＝24
x＝6 y＝12
绛旓細涓涓按鏉6鍏冿紝涓涓キ鐩12鍏冿紝鍏18鍏
绛旓細姘存澂6鍏冿紝楗洅12鍏
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