7.设用A型钢板x块,B型钢板y块
根据题意得2x+y=15
x+2y=18
解得x=4
y=7
答：用A型钢板4块,B型钢板7块
猜你喜欢
- 1你在心里想好一个两位数,将十位数字乘以2,然后加上3,再把所得新数乘以5,最后把得到的新数加上个位数字.
- 2what do you think of the dictionatry 同义句 what do you -------- -------- the dictionary
- 3we want to make sure they have got __necessary__to succeed in the task.
- 4tom says the teacher is a silly donkey
- 5英语翻译
- 6函数f（x）=cos（2/3x+π/2）+cos2/3x的图像的相邻对称轴之间的距离是
- 7甲乙丙三个数的平均数是60甲乙丙三个数的比是3:2:1,甲乙丙分别是多少?
- 8I _______ ( finished / didn’t / finishes ) my homework until my father came back.
- 9用锅烧水时当水沸腾后用盖子把锅盖住会发现已沸腾的水平静几秒钟再重新沸腾为什么
- 10山市中含有表达山市四个阶段的时间的词