Ответ:
Объяснение:
a)
23 * 17,8 - 3 * 7,2 + 23 * 7,2 - 17,8 * 3 = 17,8 * (23 - 3) + 7,2 * (23 - 3)=
= 17,8 * 20 + 7,2 * 20 = 356 + 144 = 500
б)
53 * 39 + 47 * 39 - 53 * 21 - 47 * 21 = 53 * (39 - 21) + 47 * (39 - 21) =
= 53 * 18 + 47 * 18 = 954 + 846 = 1800
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Verified answer
Ответ:
Объяснение:
a)
23 * 17,8 - 3 * 7,2 + 23 * 7,2 - 17,8 * 3 = 17,8 * (23 - 3) + 7,2 * (23 - 3)=
= 17,8 * 20 + 7,2 * 20 = 356 + 144 = 500
б)
53 * 39 + 47 * 39 - 53 * 21 - 47 * 21 = 53 * (39 - 21) + 47 * (39 - 21) =
= 53 * 18 + 47 * 18 = 954 + 846 = 1800