作业帮问几道SAT数学题,
来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/05/18 00:05:34
问几道SAT数学题,
18.
solve:
1+6+12+24+48=91
17.
solve:
suppose the line equation is
2x+3y=T,
since it passes the point (0,1)
we get,
T=3
therefore,a=-2/3,b=1,a+b=1/3.
16.
solve:
the fraction of the cake made with two eggs is
1-1/2-(1/2)*(2/3)=1/6
so,we can get the total number
N=54/(1/6)=324
therefore,the total eggs are
T=(1/2)*324*4+(1/3)*324*3+(1/6)*324*2=1080.
15.
solve:
y=z/8=x^2/8
therefore,
x^4-64x=0
so,x=0 or x=4,
x=4
7.
D
再问： 18题答案是61，您再看看。还有15题x^4-64x=0是怎么换过来的啊。第七题能不能给个步骤？怎么用方程求啊?还有17题怎么就得到了a和b的值啊？设的T是什么意思？
再答： 第七题利用斜率相等，17题是因为平行关系，所以才这么设的啊，15题把三式带入2式，求出Y，再带入1式就好了
solve:
1+6+12+24+48=91
17.
solve:
suppose the line equation is
2x+3y=T,
since it passes the point (0,1)
we get,
T=3
therefore,a=-2/3,b=1,a+b=1/3.
16.
solve:
the fraction of the cake made with two eggs is
1-1/2-(1/2)*(2/3)=1/6
so,we can get the total number
N=54/(1/6)=324
therefore,the total eggs are
T=(1/2)*324*4+(1/3)*324*3+(1/6)*324*2=1080.
15.
solve:
y=z/8=x^2/8
therefore,
x^4-64x=0
so,x=0 or x=4,
x=4
7.
D
再问： 18题答案是61，您再看看。还有15题x^4-64x=0是怎么换过来的啊。第七题能不能给个步骤？怎么用方程求啊?还有17题怎么就得到了a和b的值啊？设的T是什么意思？
再答： 第七题利用斜率相等，17题是因为平行关系，所以才这么设的啊，15题把三式带入2式，求出Y，再带入1式就好了