0.75×15+4.5×2.5 3.6×31.4+43.9×6.4 的简便运算
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0.75×15+4.5×2.53.6×31.4+43.9×6.4的简便运算0.75×15+4.5×2.53.6×31.4+43.9×6.4的简便运算0.75×15+4.5×2.53.6×31.4+43
0.75×15+4.5×2.5 3.6×31.4+43.9×6.4 的简便运算
0.75×15+4.5×2.5 3.6×31.4+43.9×6.4 的简便运算
0.75×15+4.5×2.5 3.6×31.4+43.9×6.4 的简便运算
0.75×15+4.5×2.5
=(1-0.25)*15+45*0.25
=15-15*0.25+45*0.25
=15+30*0.25
=15+7.5
=22.5
3.6×31.4+43.9×6.4
=3.6*31.4+(31.4+12.5)*6.4
=31.4*(3.6+6.4)+12.5*6.4
=31.4*10+(10+2.5)*6.4
=314+64+2.5*6.4
=378+2.5*(6+0.4)
=378+2.5*0.4+2.5*6
=378+1+15
=394
0.75*15+4.5*2.5 3.6*31.4+43.9*6.4 简便计算
0.75×15+4.5×2.5 3.6×31.4+43.9×6.4 的简便运算
简便计算 99*2.5+2.5 6.4*4.5+3.6*4.5 6.25/0.25+0.75 99*2.5+2.5 42.5+24.4/16 0.8*(13-2.53/18）
2.5:4.5=x:3.6
3.6/15+2.5*1.4
2.5/((17.2-4.5*3.6)/0.04)简算
3.6/15+2.5*1.4简便方法
在1.2、1.5、2.4、2.5、2.5、3.6、4.5中,中位数是（ )
3.6*0.75/3.6*0.75简便计算
(78.6-0.786×2.5＋0.75×21.4)÷15×1997=?
4.5%1.8、3.6*1.9+3.6、24.5-2.8+7.2、25%（0.25+2.5）的简便计算,求你们了!
简便运算1.2乘以2.5乘以64,4.5乘以3.6+6.4 .7.54-（3.2-2.46）
2.5x除于3.6=4.5解方程,并验算
2.5x除于3.6=4.5解方程,并验算
一个的2.5倍与3.6与4.5的积少0.2这个数是多少
化简比 (1)90:60:30 (2)3/2:5/4:15/7 (3)2.5:0.75:4.5 (化简比(1)90:60:30(2)3/2:5/4:15/7(3)2.5:0.75:4.5(4)8/7:2.1:1又2/1已知a:b等于5:9,a:c等于4:9求a:b:c已知a:b等于2/1:3/1,b:c等于0.3:0.2
4.5*3.6+4.5*6.5-4.5简便方法
简便计算:3.6÷0.75+0.75