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5 x 217 x 20 - 4 x 215 x 25
= ( 5 x 20 ) x 217 - ( 4 x 25 ) x 215
= 100 x 217 - 100 x 215
= 100 x ( 217 - 215 )
= 100 x 2
= 200
5 x 217 x 20-4 x 215 x 25
=(5 x 20) x 217-(4 x 25) x 215
=100 x 217-100 x 215
=100 x (217-215)
=100 x 2
=200
4x113x25-5x112x20
=100x113-100x112
=100x(113-112)
=100x1
=100
k tôi nhá bn
9900 : 36 - 15 x 11
= 275 - 165
= 110
9700 : 100 + 36 x 12
= 97 + 432
= 529
( 15792 : 336 ) x 5 + 27 x 11
= 47 x 5 + 297
= 235 + 297
= 532
( 160 x 5 - 25 x 4 ) : 4
= ( 800 - 100 ) : 4
= 700 : 4
= 175
1036 + 64 x 52 - 1827
= 1036 + 3328 - 1827
= 4364 - 1827
= 2537
215 . 869 + 215 . 14
= 215 . ( 869 + 14 )
= 215 . 883
= 189945
\(25.5.4.125.20.8\)
\(=\left(25.4\right).\left(5.20\right).\left(125.8\right)\)
\(=100.100.1000\)
\(=10000000\)
\(\text{ (215 x 4 - 76 x 5): 4}\) \(=\left(860-380\right):4=480:4=120.\)
\(215\times94+215\times5+215\)
\(=215\times\left(94+5+1\right)\)
\(=215\times100\)
\(=21500\)
215 × 94 + 215 × 5 + 215
= 215 × ( 94 + 5 + 1 )
= 215 × 100
= 21500
746x79+746+746x20=746x(79+1+20)
=746x100
=74600
129x78-78-28=78x(129-28)
=78x101
=7878
7x25x5x4=(25x4)x(7x5)
=100x35
=3500
tick mình nha!
5 x 217 x 20 - 4 x 215 x 25
= 1085 x 20 - 4 x 215 x 25
= 21700 - 4 x 215 x 25
= 21700 - 860 x 25
= 21700 - 21500
= 200
\(5.217.20-4.215.25\)
\(=\left(5.20\right).217-\left(4.25\right).215\)
\(=100.217-100.215\)
\(=100.\left(217-215\right)\)
\(=100.2=200\)
Nhớ k cho mình nhé! thank you!!!