简便计算
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25/36×4/5 +11/36÷5/4
=25/36×4/5 +11/36×4/5
=(25/36 +11/36)×4/5
=4/5
(1/2+2/3+3/4)×12
=1/2×12+2/3×12+3/4×12
=6+8+9
=23
0.125×3/4+1/8×8.25+12.5%
=1/8×0.75+1/8×8.25+1/8
=1/8×(0.75+8.25+1)
=1/8×10
=5/4
1/3+1/15+1/35+1/63+1/99+1/143
=1/2×[2/3+2/(3×5)+2/(5×7)+2/(7×9)+2/(9×11)]
=1/2×[2/3+1/3-1/5/+1/5-1/7+1/7-1/9+1/9-1/11]
=1/2×[1-1/11]
=1/2×10/11
=5/11
=25/36×4/5 +11/36×4/5
=(25/36 +11/36)×4/5
=4/5
(1/2+2/3+3/4)×12
=1/2×12+2/3×12+3/4×12
=6+8+9
=23
0.125×3/4+1/8×8.25+12.5%
=1/8×0.75+1/8×8.25+1/8
=1/8×(0.75+8.25+1)
=1/8×10
=5/4
1/3+1/15+1/35+1/63+1/99+1/143
=1/2×[2/3+2/(3×5)+2/(5×7)+2/(7×9)+2/(9×11)]
=1/2×[2/3+1/3-1/5/+1/5-1/7+1/7-1/9+1/9-1/11]
=1/2×[1-1/11]
=1/2×10/11
=5/11
2014-12-26
展开全部
最后一个应该是6/13
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大姐你连起啦?
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对不起,我说错了
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