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(a²,a+1)与(1,b)关于x轴对称,求a,b值? (2a+3b,a-b)与(3,2b)关于y轴对称,求a,b值 把That volleyball is under the bed变为复数形式 已知点p(a+3b,3)与点(-5,a+2b)关于x轴对称,则a=___,b=____快 Is that your baseball 改为复数句 write down the most important points of the speech同义句转换 = = 急速不是翻译！是同义句转换 most of the land below looked kike sand 是什么意识急!·most of the land below looked kike sand though dad told me it is gree than you think People use most of the land for ___(farm,farming) y=2^x/(1+2^x)求值域和定义域? most of the land in the tropics is not rich .rich means _______ y=(2^x-1)/(2^x-1)的定义域和值域 求y=（2^x+1）/(2^x-1)的定义域和值域 y=2^（x+2）/（x-1）的值域以及定义域求法 沙漠里有露水吗 沙漠的露珠数码相机和数码摄像机有数码不一样? His basketball is under the bed对under the bed提问 沙漠中如何接露水 there,a,under,basketball,my,is,bed(.)连词成句 《在沙漠的中心》中我为什么把露水当做希望 under the bed there is a basketball改为否定句 沙漠露水怎么获得? there,a,under,basketball,my,is,bed（.）造句 把1 2 3 4 5 6这几个数填在方框里组成一个等式,每个数字只能用一个 A+B=C+D-E+F school .l visited last year was not the one .l once studied at..为什么选B,which;where.B./;/.C.which;what.D.who;which The school where he once studied is very famous.为什么这里用where 如果 改成The school which he once studied in is very famous.就变成了用which! the school ()BIll once studied has becoem famous应该填什么呢? 英语超简单选词填空（详见补充）Most adults once studied at school,had classes and did their……Most adults once studied at school,had classes and did their homework everyday.The same thing is going on at school now ._______ it seems t he once studied at one of the most famous universities( )he doesn't want identified为什么是which不是where y=1/x+1的定义域和值域 1某市鼓励居民节约用水,对用户提出一下几点：每月用水不超过2吨,按每吨a元收费,超过 2吨,按每吨2a元收费.如果某居民这月用水收费8a元,问该居民这月用水量2某商店同一天出售了两台复读机 若g(x)为定义域为区间【c,d】上的减函数,则g(x)的最大值是（ ）,最小值是（ ） 数学整体带入求值题已知(1/a）+（1/b）=4,则（a-3ab+b/2a+2b-7ab）=________ 带入法【数学15x-2y-28=025x+3y-53=0这是一题..反正我知道答案x=2 y=1就是不知道怎么算而且要带入法,消元不行