作业帮暑假作业上有两道数学题不会做1.The weights(重量) of two boys are in the ratio 5:4.If the weight of the thinner boy is 48kg,what is the weight of the other?2.The lenghs(长度) of two rivers are in the ratio 12:7.The length of the longe
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暑假作业上有两道数学题不会做1.The weights(重量) of two boys are in the ratio 5:4.If the weight of the thinner boy is 48kg,what is the weight of the other?2.The lenghs(长度) of two rivers are in the ratio 12:7.The length of the longe
暑假作业上有两道数学题不会做
1.The weights(重量) of two boys are in the ratio 5:4.If the weight of the thinner boy is 48kg,what is the weight of the other?
2.The lenghs(长度) of two rivers are in the ratio 12:7.The length of the longer one is 42km.Find the length of the shorter one.
暑假作业上有两道数学题不会做1.The weights(重量) of two boys are in the ratio 5:4.If the weight of the thinner boy is 48kg,what is the weight of the other?2.The lenghs(长度) of two rivers are in the ratio 12:7.The length of the longe
60和24.5
第1题是说两个人体重比为5:4
48除以4再乘5得60
第2题是两条河长的比为12:7
42除以12在乘7得24.5
谢谢多给我加加分
1 48/4*5=60 kg
2 42/12*7=24.5 km
1.两者之比5：4，瘦的为48kg，另一个为5/4×48=60kg；
2.两者比12：7，长的为42km，另一个为42/（12/7）=24.5km
1 48*5/4=60
2 42/(12/7）=24.5
60
24.5
1、48*5/4=60kg
2、42*7/12=24.5km
1.Let the other is xkg,then,
5:4=x:48
x=60
2,Let the shorter river is xkm,then,
12:7=42:x
x=7*42/12=24.5
1. 5：4=x:48,然后求解x即可，x=60;
2. 12:7=42:x,然后求解x,知道x一定小于42，所以另外一个更shorter
1. if the weight of the other is x: x:48=5:4 x=60
2.if the length of the shorter one is x 42:x=12:7 x=24.5
1 48*（5/4）=60
2 42/（12/7）=24.5
会翻译就会做。。。