Question

Rút gọn biểu thức

a ) 2x + (-61)-(21-61)

b) (-3-x+5) +3

 

Answer 1

a ) 2x + (-61)-(21-61)

= 2x - 61 - 21 + 61

= 2x - 21

b) (-3-x+5) +3

= -3 - x + 5 + 3

= -x + 5

Answer 2

a) 2x + (-61) -21+61

= 2x - 21

b) (-3-x+5) +3

= -3+3-x+5

= -x+5

Answer 3

a) \(2x+\left(-61\right)-\left(21-61\right)\)

\(=2x-61-\left(-40\right)\)

\(=2x-61+40\)

\(=2x+\left(-61+40\right)\)

\(=2x-21\)

b) \(\left(-3-x+5\right)+3\)

\(=2-x+3\)

\(=-x+\left(2+3\right)\)

\(=5-x\)

Answer 4

2x+(-61)-(21-61)

=2x+(-61)+61-21

=2x-21

b)(-3-x+5)+3

=-3+3+5-x

=5-x

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