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Thực hiện nhân nghịch đảo ta được − 5 6 . 7 2 = − 35 12
b ) 12 7 c ) − 15 d ) − 3 25
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a) (-30) + 17 + (-70) + 33
=[-30+(-70)]+(17+33)
=-100+50
=-50
b) 56 - 15 - 6 + (-75)
=(56-6)-[15+(-75)]
=50-(-60)
=110
c) (157 - 56) - (44 + 57)
=157-56-44+57
=(-157-57)-(56+44)
=-100-100
=-200
d) (-24 + 174) - (174 - 24)
=-24+174-174+24
=(-24+24)+(174-174)
=0+0
=0
e) (35 - 47) - (-123 + 35) + [20 - (123 - 57)]
=35-47+123-35+[20-123+57]
=35-47+123-35+20-123+57
=(35-35)+(123-123)+(-47+57)
=0+0+(-10)
=-10
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a) $420-(71+420)$
$=420-71-420$
$=-71$
b) $(35-120)+(120+410-35)$
$=35-120+120+410-35$
$=(35-35)+(-120+120)+410$
$=410$
c) $(320-15+49)-(85-51)$
$=320-15+49-85+51$
$=320+(-15-85)+(49+51)$
$=320+(-100)+100$
$=320$
d) $-(312+59)-(41+400+88)$
$=-312-59-41-400-88$
$=(-312-88)+(-59-41)-400$
$=-400+(-100)-400$
$=-500-400$
$=-900$
e) $(430-731)-(-731+430-56)$
$=430-731+731-430+56$
$=(430-430)+(-731+731)+56$
$=56$
f) $(1352-47)-(53-1000+1352)$
$=1352-47-53+1000-1352$
$=(1352-1352)+(-47-53)+1000$
$=(-100)+1000$
$=1000-100$
$=900$
h) $(-42)-(370+58)-(120-370)$
$=-42-370-58-120+370$
$=(-42-58)+(-370+370)-120$
$=-100-120$
$=-220$
$Toru$
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a. \(\frac{1}{7}\)+ X = \(\frac{68}{35}\)
X = \(\frac{68}{35}\)-\(\frac{1}{7}\)
X = \(\frac{9}{5}\). Vậy X = \(\frac{9}{5}\)
b. \(\frac{997}{3304}\)- X = \(\frac{15}{56}\)
X = \(\frac{997}{3304}\)- \(\frac{15}{56}\)
X = \(\frac{2}{59}\). Vậy X = \(\frac{2}{59}\)
a. \(\frac{1}{7}+x=\frac{68}{35}\)
\(x=\frac{68}{35}-\frac{1}{7}\)
\(x=\frac{68}{35}-\frac{5}{35}\)
\(x=\frac{9}{5}\)
Vậy \(x=\frac{9}{5}\)
*** mk nha
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Đáp án: D
(56 . 35 + 56 . 18) : 53
= 56.(35+18):53
= 56.53:53
= 56
a) -56 - ( 47 - 56 ) + 33
= -56 - 47 + 56 + 33
= ( -56 + 56 ) - ( 47 - 33 )
= -14
b) 168 + ( 35 - 68 ) - 35
= 168 + 35 - 68 - 35
= ( 168 - 68 ) + ( 35 - 35 )
= 100