X : ABC = 100
tim abc va X
tk nhe
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Điền chữ số a,b,c sao cho abc+bca dat gia tri lon nhat va abc nhan cac gia 1,2,3 ko can thiet phai tuong ung
Ai nhnah minh tick nhe
cho tam giac abc lay m la diem diem chinh giua bc
a,so sanh dien tich tam giac abm va dien tich tam giac acm
b,so sanh dien tich tam giac abm va dien tich tam giac abc
lam giup minh nhe
a) M điểm giữa của BC nên CM = MB
Tam giác ABM và tam giác ACM có : đáy CM = MB, chung đường cao tương ứng với đáy.
Nên S(ABM) = S(ACM)
b) S(ABC) = S(ABM) + S(ACM) mà S(ABM) = S(ACM)
Nên \(S\left(ABM\right)=\frac{1}{2}S\left(ABC\right)\)
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1/2 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000% luob
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1/2 dung 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000% luon minh the
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cmr
a) abc - bca chia hết cho 99
abc va bca deu co dau gach ngang o duoi nhe
ai dung minh se tick
abc-bca
=100a+10b+c-100c-10b-a
=( 100a-a )+(10b-10b)-(100c-c)
=99a-99c=99,(a-c)chia hết cho 99
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abc - bca
= a.100 + b.10 + c - b.100 - c.10 - a
= ( a.100 -a ) + ( 10b - 10b ) - ( 100c - c )
= a.99 - c.99
= 99.(a-c) chia hết cho 99
Vậy abc - bca chia hết cho 99
Nhớ k cho mình nhé! Thank you!!!
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cho tam giac ABC vuong tai A . AB=30cm ; AC=40cm . Tren BC lay trung diem D . AE=1/3 AB . AD cat CE tai M .
a) tinh dien tich ABC .
b) so sanh dien tich AMC va AMB
c) tinh ti so dien tich AME va ABC
-- cac ban nhanh giup to cau c) nhe !!!!!!!!
Cho tam giac ABC,m la diem bat ki tren BC.Noi A va M,tren AM lay N sao cho NM=2/3 AM.noi N voi B va C.a)viet ten cac tam giac.b)so sanh dien tich tam giac NBM voi ABM.c)tinh dien tich tam giac ABC;dien tich MBC=24cm vuong.lam nhanh giup em nhe!
ai giai ho minh 2 bai nay di nhe
cho tam giac abc, ke be cat ac va cf cat ab. biet be=cf= 8cm , do dai cac doan thang bf va bc ti le voi 3 va 5
a Chung minh tam giac abc la tam giac can
b Tinh do dai canh day bc
be va cf cat nhau tai o . noi oa va ef . c/m dg thang ao la duong trung truc cua doan thang ef
1. hieu cua hai so thap phan; /abc,d va /a,bcd la 583,704. hay tinh tong hai so do. giup minh nhe cac ban dep trai dep gai nhat nha.
Theo đề bài
\(\overline{abc,d}-\overline{a,bcd}=583,704\)
\(\Rightarrow100x\overline{a,bcd}-\overline{a,bcd}=583,704\)
\(\Rightarrow99x\overline{a,bcd}=583,704\Rightarrow\overline{a,bcd}=583,704:99=5,896\Rightarrow\overline{abc,d}=589,6\)
Tổng hai số là
\(\overline{589,6}+5,896=595,496\)
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Cho tam giác ABC vuông tại A co AC=1/2BC tren tia doi cua tia AC lay D sao cho AD=AC chung minh BC va BD va tam giac BCD deu
t can gap cac bn giai ho t nhe
Xét \(\Delta ABC\) và \(\Delta ABD\) ,có :
AB : cạnh chung
AC =AD (gt)
\(\widehat{BAC}=\widehat{BAD}=90^0\)
=> \(\Delta ABC=\Delta ABD\) ( hai cạnh góc vuông )
=> BC =BD ( 2 cạnh tương ứng )
=> \(\Delta BCD\) cân tại B
Ta có : AC = 1/2 BC
Lại có : AD =AC => AD + AC = BC hay DC = BC = BD
=> \(\Delta BCD\) là tam giác đều
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abc + ac = 2.ca
Cac ban giai nhanh va dung nhe chieu mai mk phai nop roi hic
\(abc+ac=2.ca\) (1)
\(a=0\)hoặc \(c=0\)là nghiệm của (1)\(a,c\ne0\)thì: \(\frac{abc+ac}{ca}=\frac{2ca}{ca}\)\(\Leftrightarrow\)\(b+1=2\) \(\Leftrightarrow\)\(b=1\)
Vậy....
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\(abc-ac=2.ca\left(1\right)\)
* a = 0 hoặc c = 0 là nghiệm của ( 1 )
* a.c \(\ne\) thì \(\frac{abc+ac}{ca}=\frac{2ca}{ca}\)
\(\Leftrightarrow b+1=2\Leftrightarrow b=1\)
\(KL:\)
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