Question

a,100+(+430)+2145+(-530)

b,(-12) . 15

c,(+12) . 13+13 . (-22)

d,{[14 : (-2)]+7} : 2012

Answer 1

a/ 2145

b/-180

c/-130

d/0

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Answer 2

a , 100 + ( + 430 ) + 2145 + ( - 530 ) = 530 + 2145 - 530 = ( 530 - 530 ) + 2145 = 0 + 2145 = 2145

b , ( - 12 ) . 15 = - ( 12 . 15 ) = - 180

c , ( + 12 ) . 13 + 13.( - 22 ) = 13 . [ ( + 12 ) + ( - 22 ) ] = 13 . ( - 10 ) = - 130

d , { [ 14 : ( - 2 ) ] + 7 } : 2012 = { ( - 7 ) + 7 } : 2012 = 0 : 2012 = 0

Answer 3

a,100+(+430)+2145+(-530)=530+1615=2145

b,(-12).15=-180

c,(+12).13+13.(-22)=13(12+-22)=13.-10=-130

d,{[14 : (-2)]+7} : 2012={-7+7}:2012=0:2012=0