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六年级数学问题
1.(5又5/9-0.8+2又4/9)×(7.6÷4/5+2又2/5×1.25)2.1.1×4又21/97+40.9÷5又2/19-4.09×9/973.1/21+1/7...
1.(5又5/9-0.8+2又4/9)×(7.6÷4/5+2又2/5×1.25)
2.1.1×4又21/97+40.9÷5又2/19-4.09×9/97
3.1/21+1/77+1/165+1/285+1/437 展开
2.1.1×4又21/97+40.9÷5又2/19-4.09×9/97
3.1/21+1/77+1/165+1/285+1/437 展开
3个回答
展开全部
1.=5又5/9+2又4/9-0.8)×(38/5×5/4+12/5+5/4)
=26/5×25/2
=65
2.=1.1×4又21/97+40.9×19/97-4.09×9/97
=11/10×409/97+409/10×19/97-409/100×9/97
=11/10×409/97+19/10×409/97-9/100×409/97
=409/97×(11/10+19/10-9/100)
=409/97×291/100
=409×3/100
=12.27
3.貌似除不尽。
=26/5×25/2
=65
2.=1.1×4又21/97+40.9×19/97-4.09×9/97
=11/10×409/97+409/10×19/97-409/100×9/97
=11/10×409/97+19/10×409/97-9/100×409/97
=409/97×(11/10+19/10-9/100)
=409/97×291/100
=409×3/100
=12.27
3.貌似除不尽。
展开全部
1.(5又5/9-0.8+2又4/9)×(7.6÷4/5+2又2/5×1.25)
=7.2*(7.6+2又2/5)*1.25=7.2*10*1.25=90
2.1.1×4又21/97+40.9÷5又2/19-4.09×9/97=1.1×409/97+40.9*(19/97-0.9/97)=40.9*(11/97+18.1/97)=40.9*29.1/97=12.27
3.1/21+1/77+1/165+1/285+1/437 =1/(3*7)+1/(7*11)+1/(11*15)+1/(15*19)+1/(19*23)=1/4*(1/3-1/7)+1/4*(1/7-1/11)+1/4*(1/11-1/15)+1/4*(1/15-1/19)+1/4*(1/19-1/23)=1/4*(1/3-1/7+1/7-1/11+1/11-1/15+1/15-1/19+1/19-1/23)
=1/4*(1/3-1/23)=5/69
=7.2*(7.6+2又2/5)*1.25=7.2*10*1.25=90
2.1.1×4又21/97+40.9÷5又2/19-4.09×9/97=1.1×409/97+40.9*(19/97-0.9/97)=40.9*(11/97+18.1/97)=40.9*29.1/97=12.27
3.1/21+1/77+1/165+1/285+1/437 =1/(3*7)+1/(7*11)+1/(11*15)+1/(15*19)+1/(19*23)=1/4*(1/3-1/7)+1/4*(1/7-1/11)+1/4*(1/11-1/15)+1/4*(1/15-1/19)+1/4*(1/19-1/23)=1/4*(1/3-1/7+1/7-1/11+1/11-1/15+1/15-1/19+1/19-1/23)
=1/4*(1/3-1/23)=5/69
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