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Calculate the following questions: (1) 23-17 - (- 7) + (- 16) (2) (− 81) △ 94 × 49 ^ (− 16) (3) (− 114 + 58 − 712) × (− 24) (4) − 14 − (1 − 0.5) × 13 × [2 − (− 3) 2] (5) 3x2 + 2xy-4y2-3xy + 4y2-3x2
(1) The original formula = 23-17-17 + 7-16 = (23 + 7) - (17 + 16) = 30-33 = -3; (2) (the original formula = 23-17 (23 + 7) (23 + 7) (23 + 7) (17 + 7) (17 + 7) (17 + 7) (17 + 17 + 17 + 16) (23-17) (23-17-17) (23 + 7 - (17 + 17 + 16) = 30-33 = -3; (2; (2) (2) (2) (2) (as \\\\\\\\\\\\\\\\\\(5) 3x2 + 2xy-4y2-3xy + 4y2-3x2 Formula = (3x2-3x2) + (2xy-3xy) + (- 4y2 + 4y2) = - XY
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