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...
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?
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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!! 展开
2个回答
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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。
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。
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