câu 2
a) 216-(72+x)=48
b) x:24,x: 15 và 200 < x < 250
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Bài 1:
\(101\cdot125+101\cdot25-101\cdot50\)
\(=101\cdot\left(125+25-50\right)\)
\(=101\cdot100\)
\(=10100\)
Bài 2:
\(76\cdot115+56\cdot24+59\cdot24\)
\(=76\cdot115+24\cdot\left(56+59\right)\)
\(=76\cdot115+24\cdot115\)
\(=115\cdot\left(76+24\right)\)
\(=115\cdot100\)
\(=11500\)
a) ( 72 - 8x9 ) : ( 20 + 21 + 22 + 23 + 24 + 25 )
= ( 72 - 72 ) : ( 20 + 21 + 22 + 23 + 24 + 25 )
= 0 : ( 20 + 21 + 22 + 23 + 24 + 25 )
= 0
b) ( 500 x 9 - 250 x 18 ) x ( 1 + 2 + 3 + ... + 9 )
= ( 250 x 2 x 9 - 250 x 18 ) x ( 1 + 2 + 3 + ... + 9 )
= ( 250 x 18 - 250 x 18 ) x ( 1 + 2 + 3 + ... + 9 )
= 0 x ( 1 + 2 + 3 + ... + 9 )
= 0
c ) ( 11 + 13 + 15 + ... + 19 ) x ( 6 x 8 - 48 )
= ( 11 + 13 + 15 + ... + 19 ) x ( 48 - 48 )
= ( 11 + 13 + 15 + ... + 19 ) x 0
= 0
a) ( 72 - 8x9 ) : ( 20 + 21 + 22 + 23 + 24 + 25 )
= ( 72 - 72 ) : ( 20 + 21 + 22 + 23 + 24 + 25 )
= 0 : ( 20 + 21 + 22 + 23 + 24 + 25 )
= 0
39x[250+87]+64x[240+97]
=39x337+64x337
=(39+64)x337
=103x337
=34711
78x31+78x24+78x17-22x72
=78x(31+24+17)-22x72
=78x72-22x72
=(78-22)x72
=56x72
=4032
bn tính lại nha
39 x [ 250 + 87 ] + 64 x [ 240 + 97 ]
= 39 x 337 + 64 x 337
= 337 x ( 39 + 64 )
= 337 x 103
= 34711
bai tiep
78 x 31 + 78 x 24 +78 x 17 - 22
= 78 x ( 31 + 24 + 17 ) - 22 x 72
= 78 x 72 - 22 x 72
=72 x ( 72 - 22 )
= 72 x 50
= 3600
a) ( 72 - 8 x 9 ) : ( 20 + 21 + 22 + 23 + 24 + 25 )
= ( 72 - 72 ) : ( 20 + 21 + 22 + 23 + 24 + 25 )
= 0 : ( 20 + 21 + 22 + 23 + 24 + 25 )
= 0
b) ( 500 x 9 - 250 x 18 ) x ( 1 + 2 + 3 + ... + 9 )
= ( 500 x 9 - 250 x 2 x 9 ) x ( 1 + 2 + 3 + ... + 9 )
= ( 500 x 9 - 500 x 9 ) x ( 1 + 2 + 3 + ... + 9 )
= 0 x ( 1 + 2 + 3 + ... + 9 )
= 0
\(5x+375x+125x=20\)
\(x.\left(5+375+125\right)=20\)
\(405x=20\)
\(x=\frac{20}{405}\)
\(x=\frac{4}{81}\)
Vậy \(x=\frac{4}{81}\)
\(72:24x=45\)
\(3x=45\)
\(x=\frac{45}{3}\)
\(x=15\)
Vậy \(x=15\)
\(915x+285x=48\)
\(x.\left(915+285\right)=48\)
\(1200x=48\)
\(x=\frac{48}{1200}\)
\(x=\frac{1}{25}\)
Vậy \(x=\frac{1}{25}\)
\(\left(3x+4\right):5=8\)
\(3x+4=8.5\)
\(3x=40-4\)
\(3x=36\)
\(x=\frac{36}{3}\)
\(x=12\)
Vậy \(x=12\)
\(\left(15.28-x\right):\frac{2}{5}=200:4\)
\(420-x=50.\frac{5}{2}\)
\(420-x=125\)
\(x=420-125\)
\(x=295\)
Vậy \(x=295\)
Câu b mk thấy số hơi to nên ngại làm.
Dấu "." là dấu nhân b nhé
Bài 1:
a. $=(-25)(-4)(-35)=100(-35)=-3500$
b. $=16-10=6$
c. $=180-(-16)-(-36)=180+16+36=232$
d. $=250-200:[1(-3)^2+(-8)]$
$=250-200:(9-8)=250-200=50$
2.
$60+2(12-x)=-48$
$2(12-x)=60-(-48)=60+48=108$
$12-x=108:2=54$
$x=12-54=-42$
\(a,\Leftrightarrow72+x=216-48=168\\ \Leftrightarrow x=168-72=96\\ b,BC\left(24,15\right)=B\left(120\right)=\left\{0;120;240;360;480;...\right\}\\ \Leftrightarrow x=240\)