单复句子互换This is my brother This is his cousinThese are ID card Those are baseballs Is yhis your faher?X-[y-2x-(x-y)}2(a²b-3ab²)-3(2a²b-7ab²)一直m²与-2n²的和为A,1+n²与-2m²的差为B,求2A-4B先

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单复句子互换This is my brother This is his cousinThese are ID card Those are baseballs Is yhis your faher?X-[y-2x-(x-y)}2(a²b-3ab²)-3(2a²b-7ab²)一直m²与-2n²的和为A,1+n²与-2m²的差为B,求2A-4B先

单复句子互换This is my brother This is his cousinThese are ID card Those are baseballs Is yhis your faher?X-[y-2x-(x-y)}2(a²b-3ab²)-3(2a²b-7ab²)一直m²与-2n²的和为A,1+n²与-2m²的差为B,求2A-4B先
单复句子互换
This is my brother
This is his cousin
These are ID card
Those are baseballs
Is yhis your faher?
X-[y-2x-(x-y)}
2(a²b-3ab²)-3(2a²b-7ab²)
一直m²与-2n²的和为A,1+n²与-2m²的差为B,求2A-4B
先化简再求值:4X²Y-{6xy-3(4xy-2)-x²y}+1其中x=2,y=二分之一
由于看错了符号,某学生把一个多项式减去x²+6x-6误当成了加法计算,结果得到2x²-2x+3,正确的结果应该是多少?

单复句子互换This is my brother This is his cousinThese are ID card Those are baseballs Is yhis your faher?X-[y-2x-(x-y)}2(a²b-3ab²)-3(2a²b-7ab²)一直m²与-2n²的和为A,1+n²与-2m²的差为B,求2A-4B先
我是个高中生,下面为你解答
These are my brothers
These are his cousins
This is ID card
That is baseball
Are these your fathers? 很简单的
下面是数学
X-[Y-2X-(X-Y)]=X-Y+2X+(X-Y)=X-Y+2X+X-Y=4X-2Y 注意式子钱为-要加变减 减变加 +则不用 照抄就行
2(a2b-3ab2)-3(2a2b-7ab2)=2a2b-6ab2-6a2b+21ab2=15ab2-4a2b=还可以把ab提出来=ab(15b-4a)
m2与-2n2的和为A ∴A=m2-2n2 1+n2与-2m2的差为B ∴ B=1+n2+2m2
2A-4B=2(m2-2n2)-4(1+n2+2m2)=-6m2-4n2-4
4X2Y-{6xy-3(4xy-2)-x2y}+1=3x2y+6xy-5 又x=2 y=? ∴原式=6+6-5=7
最后一题 设原来的多项式为A ∴A+x2+6x-6=2x2-2x+3 A=x2-8x+9
∴A-(x2+6x-6)=x2-8x+9-x2-6x+6=15-14x

单复句子互换This is my brother This is his cousinThese are ID card Those are baseballs Is yhis your faher?X-[y-2x-(x-y)}2(a²b-3ab²)-3(2a²b-7ab²)一直m²与-2n²的和为A,1+n²与-2m²的差为B,求2A-4B先 改为复句this is my pencil box Is this your English book?单复数互换 ①This is my sister.(改为一般疑问句并作肯定回答) ②That's my bro①This is my sister.(改为一般疑问句并作肯定回答)②That's my brother.(改为否定句)③That is my sister.(改为复数形式)④This is his cousin.(改为 什么是单复句 如何分辨单复句 单复数互换:1This is a pen.2.Are these oranges?3.What's that in English?4.Is this an apple?5.Are these pencils? as在英语里是什么意思Funny as bro 和 this is funny as 这两个as 单句变复句,把句子中单数词变成复数词1.She is her cousin .______ ______her ______ 2、He is my son .______ ______ my ______3、It is my watch . Whose+名词+be动词+this/that/it.以这样的句形造一单一复句子 将下列句子进行单复数互换 These are pens Is this an orange What's that in EnglishThose are apples Are these desks is this 与is that 啥时改句子需要互换? 《This is my This is my This is a ____(really) story.My grandparents lives ____ (happy) with us.Tuesday is the ____ (three) day of yhe week.She shares ____ (she)books with me.this shop is ____(small)than that one.Who is the ____(good) in your class?Do you know ____(I) bro Is this the same bike______your bro used to use?答案是that为什么不可以填which呢? I-------walk to school because my bike is bro-ken A.must B.can C.can‘t D.have to 2根据句意或用所给的词适当形式填空.1、That is not ______(I)kite.That kite is very small,but _____(I)is very big.2、The dress is ______(she).Give it to______(she).3、Is this ______(you) watch?No,it's not_______.(I)4、______is my bro 这段英文简写谁看得懂啊ur age is same like ma younger bro.my bro is sixteen.he is grt 11.wut std r u in? 前面几行还行,但最后一行就不行了,看不懂啊