\(\dfrac{42}{98}=\dfrac{36}{84}=\dfrac{72}{168}\)

\(\dfrac{72}{45}=\dfrac{144}{90}=\dfrac{104}{65}\)

\(\left(100+58\right)\times58+\left(200-42\right)\times12\)

\(=158\times58+158\times12\)

\(=158\times\left(58+12\right)\)

\(=158\times70=11060\)

\(128\times72+14\times256\)

\(=128\times72+14\times2\times128\)

\(=128\times\left(72+28\right)\)

\(=128\times100=12800\)

\(157\times99+123+34\)

\(=157\times99+157\times1\)

\(=157\times\left(99+1\right)\)

\(=157\times100=15700\)

\(67+98\times45+23\)

\(=98\times45+90\)

\(=98\times45+45\times2\)

\(=45\times\left(98+2\right)\)

\(=45\times100=4500\)

0

5

5 tick nha Đnh Công An

a) ( 36 x 28 + 36 x 45 ) : 73

= 36 x (28 + 45 ):73

=36 x 73 :73

= 36 x (73 : 73)

= 36 x 1

= 36

b) ( 98 x 17 - 26 x 17 ) : 72

= 17 x (98-17):72

= 17 x 72 :72

=17 x (72 :72)

= 17 x 1

= 17

a) ( 36 x 28 + 36 x 45 ) : 73 = 36 

b) ( 98 x 17 - 26 x 17 ) : 72 = 17 

Bạn phải giải hẳn ra

27= \(3^3\)

a)
27=3³
30=2.3.5
80=2⁴.5
20=2².5
120=2³.3.5
 

b)
16=2⁴
48=2⁴.3
98=2.7²
36=2².3²
124=2².31

1/ 2155-(174+2155)+(-68+174)

=2155-174-2155-68+174

=[2155+(-2155)]+[(-174)+174]+(-68)

=0+0+(-68)

=-68

2/ -25.72+25.21-49.25

=25.(-72)+25.21-49.25

=25.[(-72)+21+(-49)]

=25.(-100)

=-2500

3/ 35.(14-23)-23.(14-45)

=35.14-35.23-23.14-23.45

=(35.14-23.14)+(-35.23-23.45)

=(35.14-23.14)+(-35.23-45.23)

=14.(35-23)+23.(-35-45)

=14.12+23.(-80)

=168+(-1840)

=-1672

4/ 8154-(674+8154)+(-98+674)

=8154-674-8154-98+674

=[8154+(-8154)]+[(-674)+674]+(-98)

=0+0+(-98)

=-98

5/ -25.21+25.72+49.25

=-12.25+25.72+49.25

=25.(-12+72+49)

=25.109

=2725

Đúng thì chọn đúng cho mình nhé ! 

Bạn lấy bài này ở đâu vậy

27(13-16)-16(13-27)

a)=-50
b)=-33
c)=13
d)=46
e)=-33
f)=-54
g)=29
h)=-11
i)=-120
k)=-196
l)=-108
m)=100

a)=-50

b)=-33

c)=13

d)=46

e)=-33

f)=-54

g)=29

h)=-11

i)=-120

k)=-196

l)=-108

m)=100

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