三题求解……
1个回答
2017-10-30
展开全部
第一题,
9/20-(2/3-11/20)
=9/20+11/20-2/3
=1-2/3
=1/3,
————
第二题,
13/77×4/15+2/15×4/77
=(13+2)/15×4/77
=1×4/77
=4/77,
————
第三题,
5/6×0.25+1/4×1/6
=5/6×1/4+1/4×1/6
=1/4×(5/6+1/6)
=1/4×1
=1/4
9/20-(2/3-11/20)
=9/20+11/20-2/3
=1-2/3
=1/3,
————
第二题,
13/77×4/15+2/15×4/77
=(13+2)/15×4/77
=1×4/77
=4/77,
————
第三题,
5/6×0.25+1/4×1/6
=5/6×1/4+1/4×1/6
=1/4×(5/6+1/6)
=1/4×1
=1/4
追问
谢谢你
追答
请点个采纳呗,谢谢
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