456 x 65 + 456 x 25 + 456 x 10

=456x(65+25+10)

=456x100

=45 600

`a)25xx532xx4`

`=(25xx4)xx432`

`=432xx100=43200`

`b)456xx200-456xx100`

`=456xx(200-100)`

`=456xx100=45600`

\(a,25\times432\times4=25\times4\times432=100\times432=4320\\ b,456\times200-456\times100=456\times\left(200-100\right)=456\times100=45600\)

`25 xx 432 xx 4 = (25xx4 ) xx 432 = 100 xx 432 = 43200`

`456 xx200 - 456 xx 100 = 456 xx ( 200 - 100 ) = 456 xx 100 = 45600`

25 x 432 x 4

=( 25 x 4 )x 432

= 100 x 432

= 43 200

456 x 200 - 456 x 100

= 456 x ( 200 - 100)

= 456 x 100

= 45 600

a)2500

b)2772

c)1974

d)347

e)1874

k mk nha

a,25x100=2500

b,

[(123x-456)]+25=1256

=>123x-456=1231

=>123x=1687

=>x=1687/123

\(\left[\left(123x-456\right)\right]+25=1256\)

\(123x-456=1231\)

\(123x=1231+456\)

\(123x=1687\)

\(x=1687:123\)

\(x=13\frac{88}{123}\)

Vậy \(x=13\frac{88}{123}\)

ai biết

\(a,C1:\left(75+25\right):5=100:5=20\\ C2:\left(75+25\right):5=75:5+25:5=15+5=20\)

\(b,C1:\left(84-24\right):4=60:4=15\\ C2\left(84-24\right):4=84:4-24:4=21-6=15\)

\(c,C1:\left(123+456\right):3=579:3=193\\ C2:\left(123+456\right):3=123:3+456:3=41+152=193\)

\(d,C1:\left(936-306\right):6=630:6=105\\C2:\left(936-306\right) :6=936:6-306:6=156-51=105\)

a,(75 + 25) : 5
C1: 100 : 5 = 20
C2: 75 : 5 + 25 : 5 = 15 + 5 = 20
 

b,(84 - 24) : 4
C1: 60 : 4 = 15
C2: 84 : 4 - 24 : 4 = 21 - 6 = 15
 

c,(123 + 456) : 3
C1: 579 : 3 = 193
C2: 123 : 3 + 456 : 3 = 41 + 152 = 193

d,(936 - 306) : 6
C1: 630 : 6 = 105
C2: 936 : 6 - 306 : 6 = 156 - 51 = 105

A, = 4,92

B, = 8,48

C, = 1.48

D, = 5,47

A,123:25=4,92
B.789:93=\(\frac{263}{31}\)
C,121:82=\(\frac{121}{82}\)
D,456:78=\(\frac{76}{13}\)

hok tốt .

123:25=4,92

789:93=4,483870968

121:82=1,475609756

456:78=5,846153846

Đáp số ..............