Question

tính hợp lí

a) \(1152-\left(374+1152\right)+\left(-65+374\right)\)

b) \(13-12+11+10-9+8-7-6+5-4+3+2-1\)

Answer 1

a) 1152-(374+1152)+(-65+374)

=1152-374-1152-65+374

=(1152-1152)+(-374+374)-65

=-65

Answer 2

a, 1152 - ( 374 + 1152 ) + ( -65 + 374 )

= 1152 - 374 - 1152 - 65 + 374 

= ( 1152 - 1152 ) - ( 374 - 374 ) - 65

= 0 - 0 - 65

= -65

b, 13 - 12 + 10 - 9 + 8 - 7 - 6 + 5 - 4 + 3 + 2 - 1

= ( 13 - 12 ) + 11 + ( 10 - 9 ) + ( 8 - 7 ) - ( 6 - 5 ) - ( 4 - 3 ) + ( 2 - 1 )

= 1 + 11 + 1 + 1 - 1 - 1 + 1

= 13

Answer 3

a) \(=1152-374-1152-65+374\)4

    \(=\left(1152-1152\right)+\left(374-374\right)-65\)

    \(=-65\)

b) \(=\left(13-12-1\right)+\left(11-7-4\right)+\left(10-9+5-6\right)+\left(8+3+2\right)\)

    \(=13\)

Hk tốt

Answer 4

1152 - ( 374 + 1152 ) + ( -65 + 374 )

= 1152 - 374 - 1152  +  (-65) + 374 

= ( 1152 - 1152 ) + [ (-374) + 374 ] + (-65)

= 0 + 0 + (-65)

= (-65)

Answer 5

1152-(374+1152)+(-65+374) 

= 1152 - (-374) - 1152 + (-65)+374

= (1152 - 1152 ) - (-374 +374)+(-65)

=0-0+(-65)

=-65

Answer 6

 a)  1152-( 347 + 1152)+(-65+374)= 1152 -347-1152 - 65 + 374= (1152 - 1152) + (374-374) -65=0-65=-65   

Answer 7

a) 1152-(374+1152)+(-56+374)

    = 1156-374-1152-56-374

    =(1156-1152)-(374-374)

    =4-0

    =4

b)13-12+11+10-9+8-7-6+5-4+3+2-1

    =(13-12)+11+(10-9)+(8-7)-6+(5-4)+3+(2-1)

    =1+11+1-6+1+3+3

    =14

#Thiên_Hy