第1个回答 2015-03-06
4.62x3/7-5.39x(-3/7)+3.01÷(-2又1/3)
=4.62x3/7+5.39x(3/7)-3.01x(3/7)
=3/7x(4.62+5.39-3.01)
=3/7x7
=3
(-3)²÷2又1/4x(-2/3)+4-2²x(-1/3)
=9÷9/4×(-2/3)+4-4×(-1/3)
=9x4/9x(-2/3)+4+4/3
=-8/3+16/3
=8/3
1/1x3+1/3x5+1/5x7+.....+1/99x101
=(2/1x3+2/3x5+2/5x7+.....+2/99x101)÷2
=(1-1/3+1/3-1/5+1/5-1/7+1/7-.....1/98-1/99+1/99-1/101)÷2
=(1-1/101)÷2
=100/101÷2
=50/101