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a) \(\left|5\right|+\left|-5\right|=5+5=10\)
b) \(\left|-25\right|-\left|-20\right|=25-20=5\)
c) \(\left|10\right|.\left|-16\right|=10.16=160\)
d) \(\left|-49\right|:\left|-7\right|=49:7=7\)
a ) l 5 l + l - 5 l = 5 + 5 = 10
b ) l - 25 l - l - 20 l = 25 - 20 = 5
c ) l 10 l . l - 16 l = 10 . 16 = 160
d ) l - 49 l : l - 7 l = 49 : 7 = 7
a) = 10
b) = 5
c) = 160
d) = 7
Học tốt!!!
So sánh :
-(-7) > -7
Tính:
| 5 | + | - 5 |=5+5=10
|10| . |-16|=10.16=160
|-25| - |-20|=25-20=5
|-49| : |7|=49:7=7
tick nha
-(-7) > -7
/5/ + /-5/
= 5 + 5
= 10
/10/ . /-16/
= 10 . 16
= 160
/-25/ - /-20/
= 25 - 20
= 5
/-49/ : /7/
= 49 : 7
= 7
a, \(\left|5\right|+\left|-5\right|=5+5=10\)
b, \(\left|-25\right|-\left|-20\right|=25-20=5\)
c \(\left|10\right|.\left|-16\right|=10.16=160\)
d, \(\left|-49\right|:\left|7\right|=49:7=7\)
a) |5| + |-5| = 5 + 5 = 10
b) |-25| - |-20| = 25 - 20 = 5
c) |10| . |-16| = 10 . 16 = 160
d) |-49| : |7| = 49 : 7 = 7
a.\(M=\left\{5n|n\in N,n\le5\right\}\)
b.\(P=\left\{n^2|n\in N^{\text{*}},n\le9\right\}\)
c.\(N=\left\{3n+1|n\in N,n\le7\right\}\)
a) 3/7 + 4/9 + 4/7 + 5/9
= ( 3/7 + 4/7 ) + ( 4/9 + 5/9 )
= 7/7 + 9/9
= 1 + 1
= 2
b)1/5 + 4/10 + 9/15 + 16/20 + 25/25 + 36/30 + 49/35 + 64/40 + 81/45
= 1/5 + 2/5 + 3/5 + 4/5 + 5/5 + 6/5 + 7/5 + 8/5 + 9/5
= ( 1/5 + 9/5 ) + ( 2/5 + 8/5 ) + (7/5 + 3/5 ) + ( 4/5 + 6/5 ) + 5/5
= 2 + 2 + 2 + 2 + 1
= 2 x 4 + 1
= 8 +1
= 9
c) 1/8 + 1/12 + 3/8 + 5/12
= ( 1/8 + 3/8 ) + ( 1/12 + 5/12)
= 4/8 + 6/12
= 1/2 + 1/2
= 2/4 = 1/2
mỏi tay rồi
d; (1 - \(\dfrac{1}{2}\)) x (1 - \(\dfrac{1}{3}\)) x (1 - \(\dfrac{1}{4}\)) x ... x ( 1 - \(\dfrac{1}{100}\))
= \(\dfrac{1}{2}\) x \(\dfrac{2}{3}\) x \(\dfrac{3}{4}\) x \(\dfrac{3}{4}\) x ... x \(\dfrac{99}{100}\)
= \(\dfrac{1}{100}\)
|5|+|-5|=5+5=10
|10|x|-16|=10x16=160
|-25|-|-20|=25-20=5
|-49|:|7|=49:7=7