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(1)一个钝角的度数为(5x-30)°,则x的取值范围_______.

(2)一个长方形足球场的宽是65m,如果它的周长大于330m,面积不大于7150m2,设这个足球场的长为xm,则根据题意列不等式组为_____.

A.2≤m≤3 B. 2＜m＜3 C.2＜m≤3. D. m＜2

（1）设:设适当的未知数.

（2）列:列一元一次不等式组.

（3）解:求出一元一次不等式组的解集.

（4）答:写出符合题意的答案.

⑵如果到我校的老师共1400人,学校提供大小客车共24辆进行接送,已知大客车每辆可坐60人,小客车每辆可坐45人, 请你说说，怎样安排车辆？

⑶如果大客车运费500元/辆,小客车400元/辆，现要使运费最低，请问如何安排？

⑴请问今天大约来了多少名老师?

⑵设总成本为y(元),请写出y与x的函数关系式;

⑶请确定当甲配制多少千克时，甲、乙的总成本最少？

⒈怎样列一元一次不等式组解

⒉你能编一道利用一元一次不等式