www.rtmj.net > 简便计算。4.4×0.25,0.26×5.5+2.6×0.45,19.9×0.6...

简便计算。4.4×0.25,0.26×5.5+2.6×0.45,19.9×0.6...

解:4.4*0.25=4.4/4=1.1; 0.26*(5.5+4.5)=2.6;(20-0.1)*0.67=13.4-0.067=13.333 0.8*32=(1-0.2)*32=32-6.4=25.6;0.8*32.4*12.5=8*10/8*32.4=324

4.5x0.45+5.5x0.45=(4.5+5.5)x0.45=10x0.45=4.5问题已解决记的采纳,点击右下.

解:0.26*5.5+2.6*0.45 =0.26*5.5+0.26*10*0.45 =0.26*5.5+0.26*4.5 =0.26(5.5+4.5) =0.26*10 =2.6

把一个数扩大十倍,另一个数缩小十倍,结果不变.所以可以把0.26扩大十倍变成2.6,然后把5.5缩小十倍.接着运用结合律,就成了2.6乘(0.55+.045)等于2.6乘一等于2.6

望采纳!

原式=0.45x0.6x0.25=(0.44+0.01)x0.6x0.25=0.44x0.6x0.25+0.01x0.6x0.25=(0.11x4)x0.6x0.25+0.006x0.25=(0.11x0.6)x(4x0.25)+0.0015=0.066x1+0.0015=0.066+0.0015=0.0675供参考.

①4.4+5.6*0.25=4.4+1.4=5.8 ②0.63x99+0.63=0.63*99+0.63*1=0.63*(99+1)=0.63*100=63 ③7.95-3.75+4.2=4.2+4.2=8.4

0.45*4*0.25=0.45*1=0.45

=3.45*0.45+3.45*0.55=3.45x(0.45+0.55)=3.45x1=3.45

你好! 原式=(4+0.4)*0.25=4*0.25+0.4*0.25=1+0.1=1.1. 谢谢采纳!

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