15 × (4 - 7) - 15 × (5 - 3)

= 15 × (-3) - 15 × 2

= 15 × (-3 - 2)

= -15 × 5 

= -75

--------

73 × (8 - 59) - 59 × (8 - 73)

= 73 × 8 - 73 × 59 - 59 × 8 + 59 × 73

= 8 × (73 - 59) + 73 × (59 - 59)

= 8 × 14 + 73 × 0

= 8 × 14

= 112

15 x (4-7) - 15 x (5-3)

= 15 x (-3) - 15 x (-2)

= 15 x (-3 - (-2))

= 15 x (-1)

= -15

73 x (8-59) - 59 x (8-73)

= 73 x 8 - 59 x 73 - 59 x (-65)

= 73 x 8 - 59 x (73 - (-65))

= 73 x 8 - 59 x 8

= 8 x (73-59)

= 8 x 14

= 112

a) 15 × (4 - 7) - 15 × (5 - 3)

= 15 × (-3) - 15 × 2

= 15 × (-3 - 2)

= -15 × 5 

= -75

b) 73 × (8 - 59) - 59 × (8 - 73)

= 73 × 8 - 73 × 59 - 59 × 8 + 59 × 73

= 8 × (73 - 59) + 73 × (59 - 59)

= 8 × 14 + 73 × 0

= 8 × 14

= 112

A\(-73+\left(25-49+73\right)-\left(35-59\right)\)

\(=-73+\left(-24+73\right)-\left(-24\right)\)

\(=-73+49-\left(-24\right)\)

\(=-24-\left(-24\right)=0\)

B\(\left(-145+33\right)-\left(33-145\right)-17\)

\(=-112-\left(-112\right)-17=0-17=-17\)

Bài 1 theo như bạn Asuna làm

Bài 2 :

|x-1|=0

|x| = 0+1

|x| = 1

=> x = -1 hoặc 1

b) |x-1|=1

=> Các trường hợp

TH1 : x-1 = 1

x = 1+1

x = 2

TH2 : x-1 = -1

x = -1+1

x = 0

Vậy x = -1 hoặc 0

1a)-73+(25-49+73)-(35-59)

=-73+25-49+73-35+59

=(-73+73)+(25-35)+(-49+59)

=0-10+10=0

b)(-145+33)-(33-145)-17

=(33-145)-(33-145)-17=0-17=-17

2a)|x-1|=0 =>x-1=0 => x=1

b)|x-1|=1 =>x-1=1 hoặc x-1=-1 =>x=2 hoặc x=0

a) 59 . 73 - 30² +27 . 59

=59x(73+27)-30²

=59x100-30²

=5900-900

=5000

b) 1560 : [5 . 79 -( 125 + 5. 49) + 5. 21]

=1560:[5.79-(125+245)+5.21)

=1560:[5.(79+21)-(125+245)

=1560:[500-370]

=1560:130

=12

a)   \(199\left(15-17\right)-199\left(-17+5\right)\)

\(=199.15-199.17+199.17-199.5\)

\(=199.\left(15-5\right)\)

\(=199.10=1990\)

b)   \(73\left(8-59\right)-59\left(8-73\right)\)

\(=73.8-73.59-59.8+59.73\)

\(=8\left(73-59\right)\)

\(=8.14=112\)

mình phân phối rồi nhưng rắc rối lắm, bn làm giúp mình 1 câu thôi nhé

ban hay su dung quy tac chuyen ve de pha ngoac sau do lay 73 +(-73) roi lan luot su dung tinh chat phan phoi se giai,

dap an 112

dap an cau a 112

159.(18-59)-59.(8-73)=159.(-41)-59.(-65)

                                  =(100+59).(-41)-59.(-65)

                                  =100.(-41)+59.(-41)-59.(-65)

                                 =(-4100)+59.[(-41)-(-65)]

                                  =(-4100)+1416

                                  =-2684

a)    \(73\left(8-59\right)-59\left(8-73\right)\)

\(=73.8-73.59-59.8+59.73\)

\(=8.\left(73-59\right)\)

\(=8.14=112\)

b)    \(199\left(15-17\right)-199\left(-17+5\right)\)

\(=199.15-199.17+199.17-199.5\)

\(=199.\left(15-5\right)\)

\(=199.10=1990\)

a) 73.(8-59) - 59.(8-73)

= 73 . 8 - 73 . 59 - 59 . 8 + 59 . 73

= - 73 . 59 + 59 . 73 + 73 . 8 - 59 . 8

= 0 + 8 ( 73 - 59 )

= 8 . 14

= 112

b)199.(15-17) - 199.( -17 + 5 )

= 199 . 15 - 199 . 17 - 199 . (- 17 ) + ( - 199 ) . 5

= 199 . 15 - 19 . 17 + 199 . 17 + ( - 199 ) . 5

= 199 . 15 - 0 + 199 . ( - 5 )

= 199 . [ 15 - ( - 5 ) ]

= 199 . 10

= 1990

  73.(8-59)-59.(8-73)

=73.8-73.59-59.8+59.73

=(73.8-59.8)+(73.59-59.73)

=8.(73-59)+0

=8.14+0=112+0=0

tính nhanh à

76.7-57=

k