a) 19,17x25x4=19,17(25x4)=19,17x100=1917

b)1,79x(8x125)=1,79x1000=1790

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2 câu đấy à?

\(125+173+175+27=\left(125+175\right)+\left(173+27\right)=300+200=500\)

\(125\times75+125\times25=125\times\left(75+25\right)=125\times100=12500\)

b. 2 x 8 x 50 x 25 x 125 = (2 × 50) × (8 × 125) × 25

= 100 × 1000 × 25

= 100000 × 25

= 2500000

= ( 2x50) x ( 8x125) x 25

= 100 x 1000 x 25

100000 x 25

= 2500000

b. 2 x 8 x 50 x 25 x 125 = (2 × 50) × (8 × 125) × 25

= 100 × 1000 × 25

= 100000 × 25

= 2500000

34 x 1 125 -25 x 34- 34 x 100

= 38 250 - 850 - 34 000

= 37 400 - 34 000

= 3 000

~HT~

a, 2x9x5x7x4x25

=2x5x4x25x9x7

=10x100x63

=63000

BẠN SAO THẾ A VÀ B dõ dàng

a, 4 x 25 x 9

= 100 x 9

= 900

b, 125 x 8 x 6

= 1000 x 6

= 6000

// bn cak lm sai conme đề rồi ạ?//

c) 25

a: =100x26=2600

b: =78x10=780

c: =67x100=6700

d: =1000x575=575000

\(4\times26\times25=\left(4\times25\right)\times26=100\times26=2600\\ 63\times78-53\times78=\left(63-53\right)\times78=10\times78=780\\ 67\times92+67\times8=67\times\left(92+8\right)=67\times100=6700\\ 8\times23\times25\times125=\left(8\times125\right)\times\left(23\times25\right)=1000\times575=57500\)

a: =100x26=2600

b: =78x10=780

c: =67x100=6700

d: =1000x575=575000