Question

初一几道数学题，超急！！！

⒈ 某商店今年8月份出售A型电机300台，比去年同期增加50%。问去年8月份出售A型电机多少台？

⒉ 某商家先把商品成本价提高二成本标价，又打八折销售。求售价与成本价的比值。

⒊ 在植树节里，甲、乙两班共植树55棵，其中甲班植的树比乙班植的一半多10棵，问甲、乙两班各植树多少棵？

⒋ 工厂里甲、乙两个车间1月份共产生900个机器零件。2月份与1月份相比，甲车间多生产15%，乙车间多生产10%，结果2月份两车间共生产1015个零件，问1月份甲、乙两车间各生产零件多少个？

注： 好的话，我会加更多分！！

Answer 1

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Answer 2

1)300÷（1+50%）=200（台）
答：8月份生产电机200台。
2）设成本为x 元。
1.2*0.8x÷x=24/25
答：售价与成本价的比值为24/25 。
3)设甲班植树x 棵。
x+0.5x+10=55
x=30
55-30=25
答：甲班植树30棵，乙班植树25棵。
4)设甲车间一月份生产零件x个，乙车间一月份生产零件（900-x）个。
1.15x+1.1(900-x)=1015
0.05x=25
x=500
900-500=400
答：甲车间一月份生产零件500个，乙车间一月份生产零件400个。