Question

a) \(\left[\left(-32,47\right)+68,12\right]+32,47\)

b) \(\left[\left(-61,8\right)+\left(-123,6\right)\right]+\left[83,6+61,8\right]\)

c) \(-\left(\dfrac{2}{7}+\dfrac{1}{3}-\dfrac{5}{6}\right)-\left(\dfrac{-9}{7}+\dfrac{14}{7}-\dfrac{1}{5}+\dfrac{5}{3}\right)\)

Answer 1

a,\(\left[\left(-32.47\right)+68,12\right]+32,47\)

\(=68,12+32,47-32,47=68,12\)

b,\(\left[\left(-61,8\right)+\left(-123,6\right)\right]+\left(83,6+61,8\right)\)

=\(83,6-123,6+61,8-61,8=-40\)

Answer 2

a,\left[\left(-32.47\right)+68,12\right]+32,47[(−32.47)+68,12]+32,47

=68,12+32,47-32,47=68,12=68,12+32,47−32,47=68,12

b,\left[\left(-61,8\right)+\left(-123,6\right)\right]+\left(83,6+61,8\right)[(−61,8)+(−123,6)]+(83,6+61,8)

=83,6-123,6+61,8-61,8=-4083,6−123,6+61,8−61,8=−40

Answer 3

a) [(-32.47) + 68,12] + 32,47

= 68,12+32,47−32,47

=68,12

b) [( -61,8 ) + ( -123,6 )] + ( 83,6 + 61,8 )

=83,6 - 123,6 + 61,8 - 61,8

=-4083,6 - 123,6 + 61,8 - 61,8

= -40

Còn câu C mik không nghĩ ra 

Answer 4

a,

=(-32,47) +68,12+32,47

= (-32,47+32,47)+68,47

=68,47

 

Answer 5

a) [(-32.47) + 68,12] + 32,47

= 68,12+32,47−32,47

=68,12

b) [( -61,8 ) + ( -123,6 )] + ( 83,6 + 61,8 )

=83,6 - 123,6 + 61,8 - 61,8

=-4083,6 - 123,6 + 61,8 - 61,8

= -40   

Answer 6

a) [(-32.47) + 68,12] + 32,47

= 68,12+32,47−32,47

=68,12

b) [( -61,8 ) + ( -123,6 )] + ( 83,6 + 61,8 )

=83,6 - 123,6 + 61,8 - 61,8

=-4083,6 - 123,6 + 61,8 - 61,8

= -40   

Answer 7

a,

b,

=

Answer 8

Cái này mà khó ư!?

 

Answer 9

a,

b,

=

Answer 10

a,$\left[\left(-32.47\right)+68,12\right]+32,47$

$=68,12+32,47-32,47=68,12$

b,$\left[\left(-61,8\right)+\left(-123,6\right)\right]+\left(83,6+61,8\right)$

=$83,6-123,6+61,8-61,8=-40$

Answer 11

a. [(- 32,47) + 68,12] + 32,47= 68,12+ 32,47-32,47=68,12

b) [( -61,8 ) + ( -123,6 )] + ( 83,6 + 61,8 )

=83,6 - 123,6 + 61,8 - 61,8

=-4083,6 - 123,6 + 61,8 - 61,8

= -40Câu c mik vẫn chưa nghĩ ra, xl bạn nha

Answer 12

a)[(-32,47)+68,12]+32,47

= [(-32,47)+32,47]+68,12

= 0+68,12

= 68,12

b) [(-61,8)+(-123,6]+[83,6+61,8]

= [(-61,8)+61,8]+[(-123,6)+83,6]

=0+(-40)

=-40

Answer 13

c)-(2/7+1/3-5/6)-(-9/7+14/7-1/5+5/3)

= -(-3/14)-229/105

= 3/14-229/105

= -59/30

Answer 14

c, -(2/7+1/3-5/6)-(-9/7+14/7-1/5+5/3)

=(-2/7+9/7-14/7)-(1/3+5/3)+5/6+1/5

=(-1)-2+31/30

=-59/30

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