102×678-__________×678=678×(102-2)
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Answer:
102×678-2×678=678×(102-2)
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= 102 × 678 - _____ × 678 = 678 × ( 102 - 2 )
= 69156 - _____ × 678 = 678 × 100
= 69156 - _____ × 678 = 67800
= _____ × 678 = 67800 - 69156
= _____ × 678 = - 1356
= _____ = 1356 / 678
= -2
is right answer!
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