42.120-43.17+42.34
=42.120-42.68+42.34
=42.(120-68+34)
=42.86
=16.86
=1376
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\(4^2\cdot120-4^3\cdot17+4^2\cdot34\\ =4^2\cdot\left(120-4\cdot17+34\right)\\ =16\cdot\left(120-34\right)\\ =16\cdot86\\ =1376\)
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