Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a) (-124) + 24 = -100
b) 37. 78 + 37. 22
= 37 . ( 78 + 22 )
= 37 . 100
= 3700
e: =5/7(5/11+2/11-14/11)
=5/7(-7/11)=-5/11
f: =-5/4(2/11+9/11)+1+3/4
=-5/4+7/4
=2/4=1/2
g: =-5/7(3/13+10/13)+1+5/7
=-5/7+1+5/7
=1
h: =7/4(29/5-9/5)+41/13
=-7+41/13=-50/13
72x(28-49)+28x(-49-72)
=72x(-21)+28x(-121)
=-1512+(-3388)
=-49900
Có 2 cách hiểu
+ ) 72x( 28 - 49 ) + 28x( -49 - 72)
= 72x . 28 - 72x . 49 - 28x . 49 - 28x . 72
= -72x . 49 - 28x . 49
= 49 . ( - 100x )
+) 72 . ( 28 - 49 ) + 28 . ( -49 - 72 )
= 72 . 28 - 72 . 49 -28 . 49 - 28 . 72
= -72 . 49 -28 . 49
= 49 . ( -100 ) = -4900
g: =4/9(-3/4+27/4)-14/3
=4/9*6-14/3
=8/3-14/3
=-6/3=-2
h: =11/7-3/5-4/9-4/7+8/5-5/9
=8/5
k: =-9/4(2/7-16/7)-2/3
=-9/4*(-2)-2/3
=9/2-2/3
=27/6-4/6
=23/6
m: =9/17*3/11-9/17*12/11-9/17*13/11
=9/17(3/11-12/11-13/11)
=9/17*(-2)=-18/17
\(\dfrac{\dfrac{5}{3}-\dfrac{5}{7}+\dfrac{5}{9}}{\dfrac{10}{3}-\dfrac{10}{7}+\dfrac{10}{9}}=\dfrac{5\left(\dfrac{1}{3}-\dfrac{1}{7}+\dfrac{1}{9}\right)}{10\left(\dfrac{1}{3}-\dfrac{1}{7}+\dfrac{1}{9}\right)}=\dfrac{1}{2}\)
`8 2/7-(3 4/9+4 2/7)`
`=8+2/7-(3+4/9+4+2/7)`
`=8+2/7-7-2/7-4/9`
`=1-4/9`
`=5/9`
8 2/7-(3 4/9+4 2/7)
=58/7-31/9-30/7
=(58/7-30/7)-31/9
=4-31/9
=5/9