42-56+33-(33-56+42)

=42-56+33-33+56-42

=0

54-(45-30+54)-30+5

=54-45+30-54-30+5

=-40

\(=0\)

\(=-40\)

Hk tốt

42-56+33-(33-56+42)

=42-56+33-33+56-42

=(42-42)+(33-33)+(-56+56)

=0+0+0

=0

Chúc bạn học tốt! ^-^

42-56+33-(33-56+42)

= 42 - 56 + 33 - 33 + 56 - 42

= (42-42) + (56-56) + (33-33)

= 0 + 0 + 0

= 0

Tính nhanh

Đáp án C

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

`5^6 : 5^3 +3^2 : 3^3 - 3^4 . 3`

`= 5^(6-3)+  (3^2)/(3^3) - 3^(4+1)`

`= 5^3 + 9/27 - 3^5`

`= 125 + 1/3 -243`

`=-353/3`

\(\text{1.-(-66)+34+(-73)-27+99}.\)

\(=66+34-73-27+99=100-100+99=-99.\)

\(\text{2.54-(45-30+54)-30+5}.\)

\(54-45+30-54-30+5=\left(54-54\right)+\left(-45+5\right)+\left(30-30\right)=-40.\)

\(\text{3.42-56+33-(33-56+42)}.\)

\(=42-56+33-33+56-42=\left(42-42\right)+\left(-56+56\right)+\left(33-33\right)=0.\)

\(\text{4.50-(47+50-18)+(47-18)}.\)

\(=50-47-50+18+47-18=\left(50-50\right)+\left(-47+47\right)+\left(18-18\right)=0.\)

\(\text{5.10-(28-30+4)}.\)

\(=10-28+30-4=10+30-20-8-4=20-12=8.\)

\(\text{6.-(-73)+(44-94+27)+94}.\)

\(=73+44-94+27+94=\left(73+27\right)+\left(-94+94\right)+44=100+44=144.\)

1: =66+34-73-27+99=99

2: =54-45+30-54-30+5=-40

3: =42-56+33-33+56-42=0

4: =50-47-50+18+47-18=0

5: =10-28+30-4=2-4+10=12-4=8

a) \(33\times4+5\times33+33\times3+33-99=33\times4+5\times33+33\times3+33\times1-33\times3\)

\(=33\times\left(4+5+3+1-3\right)=33\times10=330\)

b) \(256+347+453-147-56-253=\left(256-56\right)+\left(347-147\right)+\left(453-253\right)\)

\(=200+200+200=600\)

\(56+33=89\)                    \(94+16=110\)                \(38+77=115\) 

Chúc bạn học tốt   

Trả lời

$56+33=89$                    94+16=110

$38+77=115$