a, \(\left(29-9\right).\left(-9\right)+\left(-13-7\right).21\)

\(=20.\left(-9\right)+\left(-20\right).21\)

\(=-180+\left(-420\right)\)

\(=-600\)

a) (29 – 9). (-9) + (-13 – 7). 21

= 20. (-9) + [- (13 + 7). 21]

= 20. (-9) + (-20). 21

= (-20). 9 + (-20). 21

= (-20). (9 + 21)

= (-20). 30

= - (20. 30)

= - 600.

b) (-157). (127 – 316) – 127. (316 – 157)

= (- 157). 127 + (-157). (-316) + (–127). 316 + (-127). (-157)

= -157. 127 + 157. 316 – 127. 316 + 127. 157

= [- (127. 157) + 127. 157] + (157. 316 – 127. 316)

= 0 + 316. (157 – 127)

= 316. 30

= 9 480.

(-157). (127 – 316) – 127. (316 – 157)

= (- 157). 127 + (-157). (-316) + (–127). 316 + (-127). (-157)

= -157. 127 + 157. 316 – 127. 316 + 127. 157

= [- (127. 157) + 127. 157] + (157. 316 – 127. 316)

= 0 + 316. (157 – 127)

= 316. 30

= 9 480.

\(\left(-157\right)\left(127-316\right)-127\left(316-157\right)=-157.127+157.316-127.316+157.127\)

\(=157.316-127.316=316\left(157-127\right)=316.30=9480\)

a) (−27). 1011 − 27. (−12) + 27. (−1)

= (-27). (1011 - 12 + 1)

= (-27). 1000 = -27 000

b) (−9). (−9). (−9) + 103 + 9.3

= (-9). 3 + 103 + 9.3

= 9.3 - 9.3 + 103

= 0 + 103 = 103

c) (−157). (127 − 316) − 127. (316 − 157)

= (-157). 127 - 316. (-157) - 127.316 - 127. (-157)

= (-157). 127 + 316. 157 - 127. 316 + 127.157

= (127.157 - 157.127) + (316. 157 - 127.316)

= 0 + (157 - 127). 316

= 0 + 30. 316

= 9480

a) (-27).1011-27.(-12)+27.(-1)

= -27.1011 +27.12+27.(-1)
= 27.(-1011)+27.12+27.(-1)

= 27.(-1011+12-1)

= 27.(-1000)

=-27000

c) (-157)(127-316)-127(316-157)

= (-157).127+157.316-127.316+127.127

= 316.(157-127)

= 316.30

= 9480

(157). (127 – 316) – 127. (316 – 157)

= (- 157). 127 + (-157). (-316) + (–127). 316 + (-127). (-157)

= -157. 127 + 157. 316 – 127. 316 + 127. 157

= [- (127. 157) + 127. 157] + (157. 316 – 127. 316)

= 0 + 316. (157 – 127)

= 316. 30

= 9 480

\(\left(-157\right)\left(127-316\right)-127\left(316-157\right)=\left(-157\right)\left(-189\right)-127.159=29673-20193=9480\)

Lời giải:

$=(-157).127+157.316-127.316+127.157$

$=127(-157+157)+316(157-127)=0+316.30=316.30=9480$

(-157).(127 – 316) – 127. (316 – 157)

= (- 157).127 + (-157).(-316) + (–127). 316 + (-127).(-157)

= -157.127 + 157.316 – 127.316 + 127.157

= [-(127. 157) + 127. 157] + (157.316 – 127.316)

= 0 + 316.(157 – 127)

= 316.30

= 9 480

a, 3.7.23 - 21.(-17)

= 21.23  + 21.17

= 21.(23 + 17)

= 21.40

= 840

b, 7.6.3 - 7.[(-34) + 18)]

= 7.18 - 7.18 + 34.7

= 34.7

= 238

c, 71.64 + 32.(-7) - 13.32

= 71. 32 . 2 - 7.32 - 32. 13

= 32.(71.2 - 7 - 13)

= 32. (142 - 20)

= 32.122

=  3904

d, 13.(23 - 17) - 13.(23 + 17)

= 13.23 - 13.17 - 13.23 - 13.17

= (13.23 - 13.23) - (13.17 + 13.17)

= - 2.13.17

= - 26.17

= -442

e, (29 - 9).(-9) + (-13 - 7).21

= 20.(-9) - 20.21

= -20.(9 + 21)

= -20.30

= - 600

a) -329 + ( 27 - 111 ) - ( 127 - 440 )

= -329 + 27 - 111 - 127 + 440

= -329-111 -127 + 27 +440

= -440 - 100 +440

=-100

b) ( 157 - 984 ) - ( 16 - 74 ) - ( 374 - 243 )

= 157 - 984 - 16 +74 - 374 + 243

= 157 + 243 - 984 - 16 -374 + 74 

= 400 - 1000 - 300

= 100 - 1000

= -900

a) -329 +(27-111)-(127-440)

=-329+(-84)-(-313)

=-414-(-313)

=-100

(157-984)-(16-74)-(374-243)

=(-827)-(-58)-131

=-769-131

=-900

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