简便计算:23.5乘5.66减23.4乘5.67 1.2/(1.2/2.3)/(2.3/3.4)/(3.4/4.5)谢谢啦! 快快快快快快快快快快快!
问题描述：
简便计算:23.5乘5.66减23.4乘5.67 1.2/(1.2/2.3)/(2.3/3.4)/(3.4/4.5)
谢谢啦! 快快快快快快快快快快快!
答
23.5×5.66－23.4×5.67
＝23.5×5.66－23.4×（5.66＋0.01）
＝（23.5－23.4）×5.66－23.4×0.01
＝0.1×5.66－23.4×0.01
＝0.566-0.234
=0.332
答
23.5*5.66-23.4*5.67
=(23.4+0.1)(5.67-0.01)-23.4*5.67
=0.1*5.67-23.4*0.01-0.1*0.01
=0.567-0.234-0.001
=0.332
1.2/(1.2/2.3)/(2.3/3.4)/(3.4/4.5)
这么多除号你不用中括号别人看不懂的
答
23.5×5.66-23.4×5.67
=(23.4+0.1)×5.66-23.4×5.67
=23.4×5.66+0.1×5.66-23.4×5.67
=0.1×5.66-23.4×(5.67-5.66)
=0.566-23.4×0.01
=0.566-0.234
=0.332
1.2/(1.2/2.3)/(2.3/3.4)/(3.4/4.5)
=1.2×(2.3/1.2)×(3.4/2.3)×(4.5/3.4)
=4.5