(77+22-65)-(67+12-75)

=77+22-65-67-12+75

=(77-67)+(22-12)+(75-65)

=10+10+10

=30

a)

Cách 1.

\(\begin{array}{l}\left( {4 + 32 + 6} \right) + \left( {10 - 36 - 6} \right)\\ = 4 + 32 + 6 + 10 - 36 - 6\\ = 52 + \left( { - 36} \right) + \left( { - 6} \right)\\ = 52 + \left( { - 42} \right) = 52 - 42 = 10\end{array}\)

Cách 2.

\(\begin{array}{l}\left( {4 + 32 + 6} \right) + \left( {10 - 36 - 6} \right)\\ = 4 + 32 + 6 + 10 - 36 - 6\\ = 36 + 6 + 10 + \left( { - 36} \right) + \left( { - 6} \right)\\ = 36 + \left( { - 36} \right) + 6 + \left( { - 6} \right) + 10\\ = 0 + 0 + 10 = 10\end{array}\)

b) \(\left( {77 + 22 - 65} \right) - \left( {67 + 12 - 75} \right)\)

\(\begin{array}{l} = 77 + 22 - 65 - 67 - 12 + 75\\ = 77 - 67 + 22 - 12 + 75 - 65\\ = 10 + 10 + 10 = 30\end{array}\)

c) \( - \left( { - 21 + 43 + 7} \right) - \left( {11 - 53 - 17} \right)\)

\(\begin{array}{l} = 21 - 43 - 7 - 11 + 53 + 17\\ = 21 - 11 + 53 - 43 + 17 - 7\\ = 10 + 10 + 10 = 30\end{array}\)

Cần gấp

(-75).22 + 75.(-77) - 75

-75.(22 + 77 + 1)

= -75.100

= -7500

Tính nhanh:

   912 + [88 + (-453) + (-547)]

= 912 + 88 - 453 - 547

= (912 + 88) - (453 + 547)

= 1000 - 1000

= 0

Thực hiện các phép tính sau:

6-8 = 6 + (-8) = -2

3-(-9) = 3 + 9 = 12

(-5)-10 = (-5) + (-10) = -15

0-7 = -7

4-0 = 4

(-2)-(-10) = (-2) + 10 = 8

Tính:

-2+(-6)+7- 3 = -4

-5-7-3+7 = -8

(-6)-4+5-7+12 = 0

2-(-8)+10-30 = -10

Bỏ dấu ngoặc rồi tính:

a) (4+32+6)+(10-36-6)

= 4 + 32 + 6 + 10 - 36 - 6

= (4 + 32 - 36) + (6 - 6) + 10

= 0 + 0 + 10

= 10

b) (77+22+-65)-(67+12-75)

= 77 + 22 - 65 - 67 - 12 + 75

= (77 - 67) + (22 - 12) - (65 - 75)

= 10 + 10 - (-10)

= 30

c)-(-21+43+7)-(11-53-17).

= 21 - 43 - 7 - 11 + 53 + 17

= (21 - 11) - (43 - 53) - (7 - 17)

= 10 - (-10) - (-10)

= 30

Tham khảo nha!!!

a: \(-177-\left\lbrack89+\left(-177\right)+75\right\rbrack-\left(-25\right)\)

=-177-[89-177+75]+25

=-177-89+177-75+25

=-89-50

=-139

b: \(2\cdot\left\lbrack16+\left(-12\right)-5\right\rbrack+\left(-32\right)-\left(-10\right)\)

\(=2\cdot\left\lbrack16-17\right\rbrack-32+10\)

=2*(-1)-32+10

=-34+10

=-24

c: \(56\cdot53-\left\lbrack57+\left(-75\right)-\left(-9\right)\cdot2\right\rbrack\)

=2968-[57-75+18]

=2968

d: \(16\cdot\left(-45\right)+16\cdot34-\left(-16\right)\cdot\left(-89\right)\)

\(=16\left(-45+34\right)-16\cdot89\)

\(=16\left(-11-89\right)=16\cdot\left(-100\right)=-1600\)

e: \(77\cdot18-\left(-77\right)\cdot60+\left(-77\right)\cdot\left(-22\right)\)

\(=77\cdot18+77\cdot60+77\cdot22\)

\(=77\left(18+60+22\right)=77\cdot100=7700\)

1: =-12

2: =11

a, 35.(34+86) + 65.(75+45)

=35.120 + 65.120

=120.(35+65)

=120. 100

=12000

a) 35 * 34 + 35 * 86 + 65 * 75 + 65 * 45

=  35 x ( 34 + 86 )   x  65 x ( 75 + 45 )

=  35 x 120 x 65 x 120

=  120 x ( 35 + 65 )

=   120 x  100

=      12000