Question

Answer 1

a: =49*51-49*4-51*49-51*4

=-4*100=-400

b: =-41(328-128)

=-41*200=-8200

c: =32(71*2-7-13)

=32*122=3904

d: =(11-13)+(15-17)+...+(59-61)

=(-2)*13

=-26