Question

15: Tính:

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

b. (-12) .15

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

d. {[14 : (-2)] + 7} : 201

Answer 1

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

=(100+2145) +[ 430+(-530)]

=2245 + (-100) =2145

Answer 2

b) (-12). 15 = -(12.15)= -180

Answer 3

c) 12.13 +13. (-22)= 13 [ 12+(-22)] =13 .(-10)= -(13.10)=-130

Answer 4

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

= (-530 + 430) +100 + 2145

= -100 + 100 + 2145

= 0 + 2145

= 2145

b. (-12) .15

= -(12.15)

= -180

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

= (-22 + 12).13

= -10.13

= -130

d. {[14 : (-2)] + 7} : 201

= { -7 + 7 } : 201

= 0 : 201

= -201

Answer 5

d) {[14: (-2)]+7 }:201 ={ -7+7 } :201 =0 :201 =0