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`5 xx 74 xx 2 = 5xx 2 xx 74 = 10xx74 = 740`
`4xx196xx5 = 4xx5xx196 = 20xx196 = 3920`
`(50 + 25)xx4 = 50xx4 + 25xx4 = 200 + 100 = 300`
`125xx(80+8) = 125xx80 + 125xx8 = 10000 + 1000 = 11000`
a: =100x26=2600
b: =78x10=780
c: =67x100=6700
d: =1000x575=575000
\(4\times26\times25=\left(4\times25\right)\times26=100\times26=2600\\ 63\times78-53\times78=\left(63-53\right)\times78=10\times78=780\\ 67\times92+67\times8=67\times\left(92+8\right)=67\times100=6700\\ 8\times23\times25\times125=\left(8\times125\right)\times\left(23\times25\right)=1000\times575=57500\)
35 x 20 x 5 8 x 9 x 125 25 x 7 x 4 72:(8x3)
= 35 x ( 20 x5 ) = ( 8x125) x 9 = (25x4)x7 = 72: 24
= 35 x 100 = 1 000 x 9 = 100x7 = 3
= 3 500 = 9 000 =700
(36x7):4
=36: 4 x 7
= 9 x7
= 63
35 x 20 x 5 = 35\(\times\)(20 \(\times\)5)= 35 \(\times\)100=3500
8 \(\times\)9 \(\times\) 125 =(8\(\times\) 125)\(\times\)9=1000\(\times\)9=9000
25 \(\times\)7\(\times\)4=(25 \(\times\)4)\(\times\)7=100\(\times\)7=700
72 : (8\(\times\)3)=72 : 8 x 3 =(72:8) x 3=9 x 3=27
(36 x 7) : 4 =36 x 7 : 4 =7 x (36 :4)=7 x 9=63
a, 2x9x5x7x4x25
=2x5x4x25x9x7
=10x100x63
=63000
b. 2 x 8 x 50 x 25 x 125 = (2 × 50) × (8 × 125) × 25
= 100 × 1000 × 25
= 100000 × 25
= 2500000
b. 2 x 8 x 50 x 25 x 125 = (2 × 50) × (8 × 125) × 25
= 100 × 1000 × 25
= 100000 × 25
= 2500000
a) \(2900\times94+2900\times5+2900\)
\(=2900\times\left(94+5+1\right)\)
\(=2900\times100\)
\(=290000\)
b) \(34000:125:8\)
\(=34000:\left(125\times8\right)\)
\(=34000:1000\)
\(=34\)
Trả lời :
25 x 8 x 50 x 125 x 4 x 2
= ( 25 x 4 ) x ( 8 x 125 ) x ( 50 x 2 )
= 100 x 1000 x 100
= 100 000 000
~HT~
#sad
\(125\times25\times8\times4\)
\(=\left(125\times8\right)\times\left(25\times4\right)\)
\(=1000\times100\)
\(100000\)
125 x 25 x 8 x 4
= (125 x 8) x (25 x 4)
= 1000 x 100
= 100 000