八年级下册数学课后题答案（北师大版） 习题1.7的
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第一题：（1）y甲=0.4+25 y乙=0.6x
（2）当y甲<y乙时得0.4x+25<0,6x 解得x>125
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(省略部分表示与上行重复)
（2）当y甲<y乙时得0.4x+25<0,6x 解得x>125
``````` = `````````````````````=`````````````````=
````````>```````````````````````>``````````````````<
(省略部分表示与上行重复)
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