1.765×213÷27+765×327÷27 2.(9999+9997+…+9001)-(1+3+…+999) 3.19981999×19991998-19981
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![1.765×213÷27+765×327÷27 2.(9999+9997+…+9001)-(1+3+…+999) 3.19981999×19991998-19981](/uploads/image/z/205342-70-2.jpg?t=1.765%C3%97213%C3%B727%EF%BC%8B765%C3%97327%C3%B727+2.%289999%EF%BC%8B9997%EF%BC%8B%E2%80%A6%EF%BC%8B9001%29-%281%EF%BC%8B3%EF%BC%8B%E2%80%A6%EF%BC%8B999%29+3%EF%BC%8E19981999%C3%9719991998-19981)
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1.765×213÷27+765×327÷27 2.(9999+9997+…+9001)-(1+3+…+999) 3.19981999×19991998-19981
1.765×213÷27+765×327÷27 2.(9999+9997+…+9001)-(1+3+…+999) 3.19981999×19991998-19981
1.765×213÷27+765×327÷27 2.(9999+9997+…+9001)-(1+3+…+999) 3.19981999×19991998-19981
1.765×213÷27+765×327÷27
=765÷27×(213+327)
=765×540÷27
=765×20
=15300
2.(9999+9997+…+9001)-(1+3+…+999)
=(9000+999+9000+997+…+9000+1)-(1+3+…+999)
=[9000×500+(1+3+…+999)]-(1+3+…+999)
=4500000+(1+3+…+999)-(1+3+…+999)
=4500000
3.19981999×19991998-19981
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