Найдите значение выражения:

а) 69*27+31*27=
б) 202*87-102*87=
в) 977*49+49*23=
г) 263*24-163*24=
д) 438*90-238*90=
е) 603*7+603*93=

(ДАЮ 15 БАЛЛОВ!)
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