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计算:123+234+345+456+567+678+789=______
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123+234+345+456+567+678+789,
=(100+200+300+400+500+600+700)+(20+30+40+50+60+70+80)+(3+4+5+6+7+8+9),
=2800+350+42,
=3192.
故答案为:3192.
=(100+200+300+400+500+600+700)+(20+30+40+50+60+70+80)+(3+4+5+6+7+8+9),
=2800+350+42,
=3192.
故答案为:3192.
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