(0.125+0.234+0.345)×(0.234+0.345+0.456)减(0.123+0.234+0.345+0
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(0.125+0.234+0.345)×(0.234+0.345+0.456)减(0.123+0.234+0.345+0.456)×(0.234+0.345)
设0.123+0.234+0.345=a,0.234+0.345=b
a-b=(0.123+0.234+0.345)-(0.234+0.345)=0.123
则原式=a×(b+0.456)-(a+0.456)×b
=ab+0.456a-ab-0.456b
=0.456a-0.456b
=0.456(a-b)
=0.456×0.123
=0.056088
a-b=(0.123+0.234+0.345)-(0.234+0.345)=0.123
则原式=a×(b+0.456)-(a+0.456)×b
=ab+0.456a-ab-0.456b
=0.456a-0.456b
=0.456(a-b)
=0.456×0.123
=0.056088
0.123+0.234+0.345+.+0.789
0.123+0.321+0.234+0.432+0.345+0.543+……+0.789+0.987=?
化成分数 0.345 0.35 0.345 (45)循环
0.345的平方-0.345乘2.69+1.345的平方(要过程)
1.345*0.345*2.69-1.345*1.345*1.345-1.345*0.345*0.345
0.345²+1.345²-0.345×2.69
计算;1.345^2-0.345x2.69+0.345
1.345的平方*0.345*2.69减去1.345的平方减1.345*0.345的平方
计算:1.345乘0.345乘2.69减1.345的三次方减1.345乘0.345的平方
运用整式乘法公式 0.345^2 +1.345^2-0.345*2.69
1.345×0.345×2.69-1.345的平方-1.345×0.345的平方
计算:1.345×0.345×2.69-1.345²-1.345×0.345²×2