Question

求八年级第一期学期物理金牌一课一练所有答案。

Answer 1

1. dad is twice as old as junior。 gramps is twice as old as dad。the sum of the three ages is 140.how old is dramps？
junior是一份，dad就是2份，gramps就是4份，一共7份。140/7=20， 4份就是80，所以dramps就是80
2.the sum of age and zarina father’s age is 50. the product of thrie ages is 400.how old is zarina？
这句里我想是不是漏了个单词.the sum of zarina's age and zarina's father’s age
和为50，成绩为400
就考虑400， 400=4*100=8*50=10*40=……其中可以发现10+40=50
所以zarina是10岁，爸爸是40岁
3.the vampires played 20 games。the team won 4 more games than it lost。how many games did the vampires win？
一共20场，那么19,1 ； 18,2 ；17,3 ； 16,4 ；15,5；14,6 ；13,7,； 12,8 ；11,9 ；……可以看到其中已经有答案了。12比8多4场，所以胜利了12场。
4.henry‘s sister is 3 years younger thaan henry。the product of their ages is 180.how old is henry？
成绩为180 ，因为他们只差3岁，所以考虑相近的2个数字的成绩180=15*12 henry15