1楼:百度网友
7.5x2.3+1.
9x2.5+22.5x0.
4=7.5*(1.9+0.
4)+1.9x2.5+22.
5x0.4=7.5*1.
9+7.5*0.4+1.
9x2.5+22.5x0.
4=7.5*1.9+1.
9*2.5+(7.5*0.
4+22.5*0.4)
=1.9*(7.5+2.5)+0.4*(7.5+22.5)=1.9*10+0.4*30
=19+12=31
2楼:匿名用户
7.5x2.3+1.9x2.5+22.5x0.4=7.5×(2.5-0.2)+1.9×2.5+(20+2.5)×0.4
=7.5×2.5-7.5×0.2+1.9×2.5+20×0.4+2.5×0.4
=7.5×2.5+1.9×2.5+0.4×2.5-7.5×0.2+20×0.4
=2.5×(7.5+1.9+0.4)-1.5+8=2.5×(10-0.2)+6.5
=25--0.5+6.5=31
3楼:匿名用户
7.5=2.5×3
22.5=2.5×9
所以就变成
2.5×(3×2.3+1.9+9×0.4)=2.5×(6.9+1.9+3.6)=25×12.4=31
7.52.3+1.92.5+22.50.4怎么简算?
4楼:最爱喜相逢
7.5*2.3+1.
9*2.5+22.5*0.
4=(7.5/3)*(2.3*3)+1.
9*2.5+(22.5/9)*(0.
4*9)
=2.5*6.9+1.9*2.5+2.5*3.6=2.5*(6.9+1.9+3.6)
=2.5*12.4
=2.5*4*3.1
=10*3.1
=31这道题是综合copy
形的简便计算题,分
别用了乘法的性质、乘法分配率和乘法结合率。
5楼:vendetta丿
这个通过分析可以知道7.5、2.5、22.
5的最大公因数为2.5因此可以对式子进行变形为2.5(5×2.
3+1.9×1+9×0.4)=2.
5(11.5+1.9+3.
6)=42.5,望采纳
6楼:风中的纸屑
7.52.3+1.
92.5+22.50.
4解原式=3×2.5×2.3+2.
5×1.9+3×2.5×3×0.
4=2.5×6.9+2.
5×1.9+2.5×3.
6=2.5×(6.9+1.
9+3.6)
=2.5×12.4=31
7楼:匿名用户
7.52.3+1.92.5+22.50.4=2.5×
容3×2.3+2.5×1.9+20×0.4+2.5×0.4=2.5×(6.9+1.9+0.4)+8
=2.5×9.2+8
=10×9.2/4+8
=23+8=31
8楼:匿名用户
7.5×2.3+1.
9×2.5+22.5×0.
4=2.5×(2.3×3+1.
9+9×0.4)=2.5×(6.
9+1.9+3.6)
=2.5×12.4
=2.5×4×3.1
=10×3.1=31
9楼:欢欢喜喜
7.52.3+1.
92.5+22.50.
4=2.5x3x2.3+1.
9x2.3+2.5x9x0.
4=2.5x6.9+2.
5x1.9+2.5x3.
6=2.5x(6.9+1.
9+1.2)+2.5x2.
4=2.5x10+6
=25+6
=31。
10楼:匿名用户
原式=6.9×2.5+1.9x2.5+3.6x2.5=(6.9+1.9+3.6)x2.5
=12.4x2.5
=3.1x(4x2.5)
=3.1x10=31
11楼:**夸累
7.5x2.3+1.
9x2.5+22.5x0.
4=2.5x3x2.3+1.
9x2.5+2.5x9x0.
4=2.5x6.9+2.
5x1.9+2.5x3.
6=2.5x(6.9+1.
9+3.6)
=2.5x12.4=31
12楼:匿名用户
解:7.5x2.
3+1.9x2.5+22.
5x0.4=2.5x3x2.
3+1.9x2.5+2.
5x9x0.4=2.5x(3x2.
3+1.9+9x0.4)=2.
5x(6.9+1.9+3.
6)=2.5x12.4
=2.5x(4x3.1)
=2.5x4x3.1=31
13楼:玫瑰花蕊翠翠
7.5×
2.3+1.9×2.5+22.5×0.4
=2.5×(3×2.3+1.9+9×0.4)=2.5×(
回6.9+1.9+3.6)
答=2.5×(6.9+1.1+3.6+0.4+0.4)=2.5×(8+4+0.4)
=20+10+1=31
7.5×2.3+1.9×2.5+12.5×0.4用简便方法计算
14楼:山巅之鼠
7.5x2.3+1.
9x2.5+12.5x0.
4=2.5x3x2.3+1.
9x2.5+2.5x5x0.
4=2.5x(6.9+1.
9+2)
=2.5x10.8
=2.5x(10+0.8)
=2.5x10+2.5x0.8
=25+2=27
15楼:匿名用户
7.5*2.3+1.
9*2.5+12.5*0.
4=2.5*3*2.3+1.
9*2.5+2.5*5*0.
4=2.5*(6.9+1.
9+2)
=2.5*10.8
=2.5*(10+0.8)
=2.5*10+2.5*0.8
=25+2=27
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