Question

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

Answer 1

Lời giải:

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

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

Answer 2

(-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