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The positions of rational numbers a, B and C on the number axis are shown in the figure. If M = | a + B | - | B-1 | - | a-c | - | 1-C |, the value of 100m is______ ．
M = | a + B | - | B-1 | - | a-c | - | 1-C | = - A-B + B-1 + a-c-1 + C = - 2, so 100m = - 200, so the answer is - 200
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