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a, 5/-14. 7/-19=8/38
b, -15/4 .( 16/-25 )=12/5
c, 3/-10 .( -15/-2 )=
d, -5/7 . ( 21/-10 )=-9/4
e, 10/-3. (6/-5)==4
f, 21/-9 . ( -6/14 )=1
g, -10/9 . ( 36/20 )=-2
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!!!
a; \(\dfrac{9}{27}\) + \(\dfrac{7}{-49}\)
= \(\dfrac{1}{3}\) - \(\dfrac{1}{7}\)
= \(\dfrac{7}{21}\) - \(\dfrac{3}{21}\)
= \(\dfrac{4}{21}\)
b; - \(\dfrac{12}{10}\) + \(\dfrac{-25}{30}\)
= - \(\dfrac{6}{5}\) - \(\dfrac{5}{6}\)
= -\(\dfrac{36}{30}\) - \(\dfrac{25}{30}\)
= \(\dfrac{-61}{30}\)
c; \(\dfrac{-20}{35}\) + \(\dfrac{-16}{-24}\)
= - \(\dfrac{4}{7}\) + \(\dfrac{2}{3}\)
= - \(\dfrac{12}{21}\) + \(\dfrac{14}{21}\)
= \(\dfrac{2}{21}\)
d; - \(\dfrac{21}{77}\) + \(\dfrac{10}{-35}\)
= - \(\dfrac{3}{11}\) - \(\dfrac{2}{7}\)
= - \(\dfrac{21}{77}\) - \(\dfrac{22}{77}\)
= - \(\dfrac{43}{77}\)
1/2×(2×x-3)+105/2=-137/2
1/2×(2×x-3)=-137/2-105/2
1/2×(2×x-3)=-242/2
2×x-3=-242/2:1/2
2×x-3=-242
2.x=(-242)+3
2.x=239
x=239:2
x=239/2
A,-12×25-25×75-25×13
=[(-12)-75-13].25
=(-100).25
-2500
B,-50/7×49/10-35/2×-10/7+ -25/3× -9/5
=(-35)-(-25)+(-13)
=-23
C,-354+265-156+125
=[(-354)-156]+(265+125)
=(-510)+277
=-233
D,-74+40-50+16-35
=(-74)+40+(-50)+16+(-35)
=[(-74)+(-35)]+[40+(-50)+16]
=(-109)+26
=-83
E,-2/3×4/5+-4/5×4/3-0,125
=-2/3.4/5+4/5.(-4/3)-0,125
=4/5.[-2/3+(-4/3)]-0,125
=4/5.(-2)-0,125
=-8/5-0,125
=(-1,6)+(-0,125)
=-1,725
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