3/4*2/3÷2/3=3/4
这道题正确答案是3/4
2、简便计算,
2009÷(2009+2010分之2009)
=1÷(1+1/2010)
=2010/2011
7分之4×2分之3÷7分之2×3分之4
=4/7*3/2*7/2*4/3
=4
1×2分之1+2×3分之1+3×4分之1+······+2008×2009分之1
=1-1/2+1/2-1/3+1/3-1/4+.+1/2008-1/2009
=1-1/2009
=2008/2009
3/4*2/3÷2/3=3/4
这道题正确答案是3/4
2、简便计算,
2009÷(2009+2010分之2009)
=1÷(1+1/2010)
=2010/2011
7分之4×2分之3÷7分之2×3分之4
=4/7*3/2*7/2*4/3
=4
1×2分之1+2×3分之1+3×4分之1+······+2008×2009分之1
=1-1/2+1/2-1/3+1/3-1/4+.+1/2008-1/2009
=1-1/2009
=2008/2009