a,48x19+48x115+124x52

=48x(19+115)+124x52

=48x124+124x52

=124x(48+52)

=124x100

=12400

b,27x121-87x27+73x34

=27x(121-87)+73x34

=27x34+73x34

=34x(27+73)

=34x100

=3400

c,125x98-125x46-52x25

=125x(98-46)-52x25

=125x52-52x25

=52x(125-25)

=52x100

=5200

d,136x23+136x17-40x36

=136x(23+17)-40x36

=136x40-40x36

=40x(136-36)

=40x100

=4000

e,17x93+116x83+17x23

=17x93+17x23+116x83

=17x(93+23)+116x83

=17x116+116x83

=116x(17+83)

=116x100

=11600

g,19x27+47x81+19x20

=19x27+19x20+47x81

=19x(27+20)+47x81

=19x47+47x81

=47x(19+81)

=47x100

=4700

h,87x23+13x93+70x87

=87x23+70x87+13x93

=87x(23+70)+13x93

=87x93+13x93

=93x(87+13)

=93x100

=9300

Nhớ like mik nhé!^-^ Mất bao thời gian của mik đấy!