1.49+499+4999+49999+49991.49+499+4999+49999+499999; 2.(1+11+21+31+41)+(9+19+29+39+49) 3.(9999+9997+1995+……+9001)-(1+3+5+……+999 ) 4.123+234+345+456+5657+678+789 5.1400÷25÷8+350÷4÷125 6.9÷13+13÷9+11÷13+14÷9+6÷136.

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