По действиям!

1.
-27 * (-1,2) + 3,5 * (-2,8)
2,
-7,4 * 0,6 - 3,8 * (-2,8)
3.
(-9,3 - 1,7) * (2,6 + (-5,9))
4.
47/12 * (1 3/11 ) - (-1 1/15) * (-45/64)

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