Question

7.5✘2.3+1.9✘2.5+22.5✘0.4怎么简算？

Answer 1

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。

Answer 2

7.5✘2.3+1.9✘2.5+22.5✘0.4
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

Answer 3

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

Answer 4

7.5✘2.3+1.9✘2.5+22.5✘0.4
=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。

Answer 5

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