那位高手能把这道题解出来,我给高分：哥和弟两人5年后的年龄和是30岁,弟今年年龄恰好是兄弟两人年龄差的2倍,今年兄弟二人各多少岁?_百度作业帮
那位高手能把这道题解出来,我给高分：哥和弟两人5年后的年龄和是30岁,弟今年年龄恰好是兄弟两人年龄差的2倍,今年兄弟二人各多少岁?
哥哥和弟弟两人5年后的年龄和是30岁 弟弟今年的年龄恰好是兄弟二人年龄差的2倍 今年兄弟二人各几岁?5年后的年龄和是30岁,说明今年的年龄和为20岁.（30-5-5=20)根据第二句设兄弟二人的年龄差为X,则今年弟弟的年龄为2X,哥哥的年龄就为（2X+X=3X）.根据弟弟和哥哥的年龄关系有：2X+3X=20.解出X=4.则弟弟2X=8岁,哥哥3X=12岁.答：哥哥今年12岁,弟弟8岁.
这个真的神仙都做不出，因为题目的条件没有给全。后面一句话好像漏了什么。
X+Y+10=30Y-X=2XX=5，Y=15岁，弟弟5岁，哥哥15岁
a+b+10=30a-b=2ba=15b=5
抱歉啊，是2倍，没打出来
抱歉，是2倍，我忘记写了
a+5+b+5=30，a+b=20
2（a-b)=b，解出： a=12，b=8
即 哥哥现在12岁，弟弟现在8岁。那位高手能把这道题解出来,我给高分：哥和弟两人5年后的年龄和是30岁,弟今年年龄恰好是兄弟两人年龄差的2倍,今年兄弟二人各多少岁?_百度作业帮
那位高手能把这道题解出来,我给高分：哥和弟两人5年后的年龄和是30岁,弟今年年龄恰好是兄弟两人年龄差的2倍,今年兄弟二人各多少岁?
哥哥和弟弟两人5年后的年龄和是30岁 弟弟今年的年龄恰好是兄弟二人年龄差的2倍 今年兄弟二人各几岁?5年后的年龄和是30岁,说明今年的年龄和为20岁.（30-5-5=20)根据第二句设兄弟二人的年龄差为X,则今年弟弟的年龄为2X,哥哥的年龄就为（2X+X=3X）.根据弟弟和哥哥的年龄关系有：2X+3X=20.解出X=4.则弟弟2X=8岁,哥哥3X=12岁.答：哥哥今年12岁,弟弟8岁.
这个真的神仙都做不出，因为题目的条件没有给全。后面一句话好像漏了什么。
X+Y+10=30Y-X=2XX=5，Y=15岁，弟弟5岁，哥哥15岁
a+b+10=30a-b=2ba=15b=5
抱歉啊，是2倍，没打出来
抱歉，是2倍，我忘记写了
a+5+b+5=30，a+b=20
2（a-b)=b，解出： a=12，b=8
即 哥哥现在12岁，弟弟现在8岁。38.\x05He often hears them read English in the morning.(改被动语态)They _______ often _______ _______ _______ English in the morning.39.\x05If you can learn from your failures,you’ll always have the chance to ________.(success)40.\x05Now that you are a college student,you _百度作业帮
38.\x05He often hears them read English in the morning.(改被动语态)They _______ often _______ _______ _______ English in the morning.39.\x05If you can learn from your failures,you’ll always have the chance to ________.(success)40.\x05Now that you are a college student,you should learn to be __________.(dependent)41.\x05Don’t lose hope,you can overcome all those ____________.( difficult )42.\x05They were ________ in swimming across the river.(succeed)43.\x05The boy managed to swim across the river.(同义句)The boy _______ _______ swimming across the river.44.\x05I forgot to bring my ID card from my home this morning.(同义句)I _________ my ID card at home this morning.45.\x05His father made him a kite last week.(改被动语态)A kite _______ _______ _______ him by his father last week.46.\x05Tom asked me,“Will you go to America next month?” （改为宾语从句）Tom asked me ___________ I _________ go to America the next month.47.\x05-- You look very pale.What’s the matter?Anything I can do for you?--__________.A.That’s right.\x05\x05B.That’s all right\x05C.All right\x05\x05D.Thanks very much,but I can manage48.\x05Her success made ________ possible for the following women to get equal rights.A.this B.that C.it D./ 49.\x05There _______ a great number of foreigners at the conference.A.is B.are C.have D.has50.\x05A:Excuse me,would you please show me how to use the computer?B:_______.A.It’s a pleasure B.My pleasure C.With pleasure D.It’s none of my business51.\x05We should _________ the old and don’t always argue with them.A.respect\x05B.responsible\x05C.refuse\x05D.review52.\x05Not only my daughter but also I _________ to New York,and we are both back now.A.has gone\x05B.has been\x05C.have gone\x05D.have been 53.\x05We __________ any drink.You’d better buy some fruit and vegetables.A.needn’t \x05 B.don’t need to\x05 C.don’t need\x05 \x05D.not need54.\x05I felt very tired last night,so I fell asleep as soon as I ______ in bed.A.lay B.lied C.laid D.lie55.\x05Jane has come back,but ______ girls in the class haven’t.A.the other B.the others C.other D.others}