7 5x2 3 1 9x2 5 22 5x0 4怎样用简便运算

2021-03-12 14:35:19 字数 3313 阅读 1964

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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