Упростите выражение. Найдите значение выражения,если cd=7.
1) ((-3c)×2.5)×(-4d)
2) 1.5c×((-8d)×7)
3) (c×(-5))×0.4d
4) ((-0.3c)×(-2))×(10d)
1) ((-3c)×2.5)×(-4d)
2) 1.5c×((-8d)×7)
3) (c×(-5))×0.4d
4) ((-0.3c)×(-2))×(10d)
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((-3с) * 2,5) * (-4d) = 30 * cd = 30 * 7 = 210
1,5c * ((-8d) * 7) = - 84 * cd = - 84 * 7 = - 588
(c * (-5)) * 0,4d = - 2 * cd = - 2 * 7 = - 14
((-0,3c) * (-2)) * (10d) = 6 * cd = 6 * 7 = 42