計算設z=eˆ;xy+cos(x+y),x=1,y=0,⊿y=0.2時dz的值是什麼?想知道過程,

計算設z=eˆ;xy+cos(x+y),x=1,y=0,⊿y=0.2時dz的值是什麼?想知道過程,

這個題目表意不是很清楚,莫非是y的值變化0.2時,求z值得變化?
剛才不是解了嗎?
∂;z/∂;x=yeˆ;(xy)-sin(x+y)x=1,y=0時,∂;z/∂;x=-sin1
∂;z/∂;y=xeˆ;(xy)-sin(x+y)x=1,y=0時,∂;z/∂;y=1-sin1
⊿y=0.2時
dz=∂;z/∂;x*⊿x+∂;z/∂;y*⊿y
=-sin1*⊿x+0.2(1-sin1)
計算設z=eˆ;xy+cos(x+y),x=1,y=0,⊿y=0.2時dz的值是什麼?我想知道過程,
∂;z/∂;x=yeˆ;(xy)-sin(x+y)x=1,y=0時,∂;z/∂;x=-sin1
∂;z/∂;y=xeˆ;(xy)-sin(x+y)x=1,y=0時,∂;z/∂;y=1-sin1
⊿y=0.2時
dz=∂;z/∂;x*⊿x+∂;z/∂;y*⊿y
=-sin1*⊿x+0.2(1-sin1)
設函數f(x)=xm+tx的導數f′(x)=2x+1,則數列{1f(n)}(n∈N*)的前n項和為()
A. n-1nB. n+1nC. nn+1D. n+2n+1
對函數求導可得f′(x)=mxm-1+t=2x+1由題意可得,t=1,m=2∴f(x)=x2+x=x(x+1)∴1f(n)=1n(n+1)=1n-1n+1∴Sn=1-12+12-13+…+1n-1n+1=1-1n+1=nn+1故選C
兩個數最小公倍數是84,他正好是這兩個數的最大公約數的14倍,求這兩個數.
上面算錯了,
最大公約數是84÷14=6
14=2×7=1×14
所以兩個數是12和42或6和84
最大公約數是84÷14=7
14=2×7=1×14
所以兩個數是14和49或1和84
複句如何變為單句
去掉關聯詞,縮句
已知兩個自然數的和是60,他們的最大公約數與最小公倍數之和是84,求這兩個自然數各是多少?
設所求二數為x,y,且(x,y)=d,令x=ad,y=bd,則(a,b)=1.根據題意有a+b=60d1+ab=84d,由於(60,84)=12,所以d=l,2,3,4,6,12.而當d:1,2,3,4,6時,方程組無解.當d=12時,方程組變為a+b=5ab=6,解得a=2b=3或a=3b=2.故所求的兩數為x=24,y=36.答:這兩個自然數為24和36.
按要求改句子,每空一詞.
1.The school is large and it has lots of trees.(改為同義句)
It is a large school ___ ____ ____ _____.
2.That house is where my father was born.(改為同義句)
My father was born ____ _____ _____
3.Tourists can see(the Jinmao Tower)there.(對括弧裏的提問)
___ ___ ___see there?
with lots of trees
in that house
What can tourists
It is a large school [with lots of trees].My father was born [in that house].[What can tourists] see there?答案在[ ]括弧裡面~望採納~
很高興為你解答。
with lots of trees
in that house
What can tourists
希望能幫上你,謝謝
1. and has many trees
2.in that house
3.What can routists
希望能幫到你!
第一個題答案是:with lots of trees
第二個題答案是:in that house
第三個題答案是:What the tourists can
已知兩個自然數的和是60,他們的最大公約數與最小公倍數之和是84,求這兩個自然數各是多少?
設所求二數為x,y,且(x,y)=d,令x=ad,y=bd,則(a,b)=1.根據題意有a+b=60d1+ab=84d,由於(60,84)=12,所以d=l,2,3,4,6,12.而當d:1,2,3,4,6時,方程組無解.當d=12時,方程組變為a+b=5ab=6,解…
1.Does he like English?
2.She plays football every day.
希望親們可以幫我呢--.
我實在是搞不明白額.因為覺English跟複數沒關係語言不都是不可數名詞麼..
而且複數句一般都是有××東西..
從沒遇到過這樣兒的.
再次感謝親們
1.Do they like English?
2.They play football every day.
30,90,60的最大公約數是(),最小公倍數是()

最大公約數30
最小公倍數180