简便运算:0.61×0.25+0.81×1/4+0.21×25%....错了,是0.18
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![简便运算:0.61×0.25+0.81×1/4+0.21×25%....错了,是0.18](/uploads/image/z/436111-7-1.jpg?t=%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97%3A0.61%C3%970.25%2B0.81%C3%971%2F4%2B0.21%C3%9725%25....%E9%94%99%E4%BA%86%EF%BC%8C%E6%98%AF0.18)
简便运算:0.61×0.25+0.81×1/4+0.21×25%....错了,是0.18
简便运算:0.61×0.25+0.81×1/4+0.21×25%
....错了,是0.18
简便运算:0.61×0.25+0.81×1/4+0.21×25%....错了,是0.18
0.61×0.25+0.18×1/4+0.21×25%
=(0.61+0.18+0.21)×0.25
=1×0.25
=1
0.61×0.25+0.81×1/4+0.21×25%
=(0.61+0.81+0.21)×25%
=1.63/4
=0.4075
0.61×0.25+0.81×1/4+0.21×25%
=0.61X0.25+0.81x0.25+0.21x0.25
=(0.61+0.81+0.21)x0.25
=1.63x0.25
=0.4075