bài 1 1) (-15).48-15.115+15.(-37) 2)3^4.13+3^4/3^4.7-3^6 3)9a+12b+2a-b với a+b

1) (-15).48-15.115+15.(-37)

= 15.(-48 -115 -37)

= 15.(-200) = -3000

2) (3^4.13+3^4)/(3^4.7-3^6)

= [3^4.(13+1)]/[3^4.(7-3²)]

= (3^4.14)/[3^4.(-2)]

= -7

3)9a+12b+2a-b với a+b = 100

= 9a +12b +2a -b

= 11a +11b

= 11.(a+b)

= 11.100 = 1100