Question

急急急急急急急急急急急急急急

求【1+0.12+0.34】乘【0.12+0.34+0.56】减【1+0.12+0.34+0.56】乘【0.12+0.34】的值。【提示：设1+0.21+0.34=a，0.12+0.34=b简化计算过程】

Answer 1

1+0.21+0.34=a，0.12+0.34=b
1+0.12+0.34=a，0.12+0.34+0.56=b+0.56
1+0.12+0.34+0.56=a+0.56 0.12+0.34=b
原式=a*(b+0.56)-(a+0.56)*b
=ab+0.56a-ab-0.56b
=0.56a-0.56b
=0.56(a-b)
=0.56(1+0.12+0.34-0.12-0.34)
=0,56 *1
=0.56
你看下，明白没？没得话，我再解释！
这里说实在的最主要的还是方法，方法掌握了，类似的问题都能解决了！
希望我的回答对你有帮助，祝你好运！像这样的问题自己多尝试下，下次才会的！

祝你学业进步！

Answer 2

原式=a*(b+0.56)-(a+0.56)*b
=ab+0.56a-ab-0.56b
=0.56a-0.56b
=0.56(a-b)
=0.56(1+0.12+0.34-0.12-0.34)
=0,56

Answer 3

a(b+0.56)-(a+0.56)b
=ab+a0.56-ab-b0.56
=0.56(a-b)
=0.56(1+0.21+0.34-0.12-0.34)
=0.56