简便运算7．6×99+0．76×10．2÷1．021978×298129812981—2980×19771977197733×44+44×55+55×66—66×77123×5．67+8．76×567帮帮偶吧后天要交作业的

Answer 1

7．6×99+0．76×10．2÷1．02
=7.6*99+7.6*1
=7.6*(99+1)
=7.6*100
=760
1978×298129812981—2980×197719771977
=1978*2981*100010001-2980*1977*100010001
=100010001*(1978*2981-1977*2980)
=100010001*[(1977+1)(2980+1)-1977*2980]
=100010001*[2980+1977+1]
=100010001*4958
=495849584958
33×44+44×55+55×66—66×77
=11*11(12+20+30-42)
=121*20
=2420
123×5．67+8．76×567
=123*5.67+876*5.67
=5.67*(123+876)
=5.67*1000
=5670