13.4乘0.24加3.98简便运算-搜答案-搜搜考试网

解;111×37+999×7=111×37+111×9×7=111×37+111×63=111×（37+63）=111×100=11100

13.4X0.24+3.98=6.7X2X0.3X0.8+3.98=6.7X0.3X1.6+3.98=2.01X1.6+3.98=3.216+4-0.02=7.196

=999*7+111*9*3=999*(7+3)=9990

0.79×0.64+7.9×0.24+11.4×0.079=0.79×0.64+0.79×2.4+1.14×0.79=0.79×（0.64+2.4+1.14）=0.79×4.18=3.3022

2008×2010×（1/2008×2009+1/2009×2010)=2008×2010×(1/2008-1/2009+1/2009-1/2010)=2008×2010×(1/2008-1/2010

两种方法1.0.87*2.5+0.87*10*7.5=0.87*(2.5+10*7.5)=0.87*77.52.0.87*2.5+8.7*3*2.5=2.5*(0.87+8.7*3)=2.5*(0.8

75乘4.67加5.99乘25=25x3x4.67+5.99x25=25x(14.01+5.99)=25x20=500

用计算机一下就出来了.或者换成分数、14/5*6/518/5*6/5=206/25*代表乘以

0.79X0.46+7.9X0.24+11.4X0.079=0.79X0.46+0.79X2.4+1.14X0.79=0.79X（0.46+2.4+1.14）=0.79X4=3.16翁锦文为你解答,如

9999*7+1111*37=1111*9*7+1111*37=1111*(9*7+37)=1111*100=111100

经过察看可以发现,每个乘法式子里都包含乘数0.79的倍数,经过变换,可以把0.79提取出来,办法如下：\x0d0.79*0.46+7.9*0.24+11.4*0.079

经过观察可以发现,每个乘法式子里都包含乘数0.79的倍数,经过变换,可以把0.79提取出来,方法如下：0.79*0.46+7.9*0.24+11.4*0.079=0.79*0.46+0.79*2.4+

35x17+35x9+70x7=35x17+35x9+35x14=35x(17+9+14)=35x40=1400

1.5(30乘2.08加37.6)等于150

2.78x4.9+0.49x72.2=(2.78+7.22)x4.9=3x4.9=14.7

原式=33×33+33×67=33×（33+67）=33×100=3300

2.38*4.1+5.9*2.38=2.38*（4.1+5.9）=2.38*10=23.8

原式=48×(23+26+51)=48×100=4800

7.6×0.28+0.24×2.8=（7.6÷10）×（0.28×10）+0.24×2.8=0.76×2.8+0.24×2.8=（0.76+0.24）×2.8=1×0.28=0.28