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14+24=1−78=47−27=1−34−14=34−34=612+512=69−49=29+39+49=56−46=25+25=516+316=1217−217−717=

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▼优质解答
答案和解析
14+24=34, 1−78=18, 47−27=27, 1−34−14=0, 34−34=0, 612+512=1112, 69−49=29, 29+39+49=1, 56−46=16, 25+25=45, 516+316=12, 1217−217−717=317.