Раскрыть скобки и решить.

а)5,1 + 8,4 - (-5,1) - 10,2 - (+8,4) - 9,8 - (-15)
б) -7,81 + 9,54 - 5,32 - (+7,81) + (+5,32) - 9,64
в)13,4 + 8,22 - (+1,3) - (-4,78) + (-8) - 10 - 3,4
г)-21 + (-0,68) - (-7,4) + (-3,2) - (+6,8) + 21,68
д)-48 + 51 : 10 + 4,8 х 10 + (-6,4) - 5,1 - (-7,2) - (+3)
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