Đăng ít thôi, đề dài vậy ko co kiên nhẫn đọc.
Kb ko?
42 . 125 . 7
= 16 . 125 . 7
= 2 . 8 . 125 . 7
= 2 . 7 . 8 . 125
= 14 . 1000
= 14000
34 . 32 + 69 . 34 - 34
= 34 . ( 32 + 69 - 1 )
= 34 . 100
= 3400
\(4^2.125.7\)
\(=16.125.7\)
\(=14000\)
\(34.32+69.34-34\)
\(=34.\left(32+69-1\right)\)
\(=34.100\)
\(=3400\)
a) 42. 125 . 7
= 16 . 125 . 7
= 2000 . 7
= 14000
b) 34 . 32 + 69 . 34 - 34
= 34 .( 32 + 69 ) - 34
= 34 . 101 - 34
= 3434 - 34
= 3400
b, \(34.32+69.34-34\)
\(=34.\left(32+69-1\right)\)
\(=32.100=3200\)
