827 + 53893 + 527 

= ( 827 + 53893 ) + 527 

= 54720 + 527

= 55247

ok

Tính nhanh:

827 + 53893 + 527 

= ( 53 893 + 827) + 527 

= 54 720 + 527 

= 55 247 

Ps: mình thấy cũng ko nhanh cho lắm! 

^^ Học tốt!

a,

= ( 125 . 8 ) . ( 15 . 2 ) . 98

= 1000 . 30 .98

= 29400000

b,

= ( 125 . 8 ) . ( 15 . 4 ) . 6

= 1000 . 60 . 6

=3600000

c,

= ( 55. 15 ) . ( 17 . 16 )

= 825 . 272

= 2244000

d, 

= ( 450. 2 ) . ( 25 . 8 )

= 900 . 200

= 1800000

e, 

= ( 53893 + 827 ) + 527

= 547200+ 527

= 552470

mk nghĩ vậy, mk k bt sai hay không

\(\left(527-34\right)+\left(-150+34-527\right)\)

\(=527-34-150+34-527=\left(527-527\right)+\left(-34+34\right)-150=-150\)

\(367+\left|-550\right|+\left|-33\right|-248-\left|-202\right|\)

\(=367+550+33-248-202=\left(367+33\right)-\left(248+202\right)+550=500\)

\(231.72+769.87+231.15=231\left(72+15\right)+769.87=87\left(231+769\right)=87000\)

Đáp án là A

Đáp án là B

\(=\dfrac{637.\left(526+1\right)-189}{526.637+448}=\dfrac{637.526+637-189}{526.637+446}=\dfrac{637.526+448}{526.637+448}=1\)

\(\left(637.527-189\right):\left(526.637+448\right)\)

\(=\left(335699-189\right):\left(335062+448\right)\)

\(=335510:335510\)

\(=1\)

\(-173-\left(-1324+827\right)-\left(139+324\right)\)
\(=-173+1324-827-139-324\) 
\(=\left(-173-827\right)+\left(1324-324\right)-139\)
\(=-1000+1000-139\)
\(=0-139=-139\)

a) 

− 5 18 = − 10 36 7 − 12 = − 21 36

b) 

− 8 27 = − 16 54 − 7 18 = − 14 36