Question

7.5✘2.3+1.9✘2.5+22.5✘0.4怎么简算？

Answer 1

原式=3×2.5×2.3 + 1.9×2.5 + (20+2.5)×0.4
=2.5×(3×2.3 + 1.9) + 20×0.4 + 2.5×0.4
=2.5×8.8 + 8 + 1
=2.5×4×2.2 + 9
=10×2.2 + 9
=22 + 9
=31

Answer 2

原式＝7.5×2.3+1.9×2.5+22.5×0.4
＝2.5×3×2.3+2.5×1.9+2.5×9×0.4
＝2.5×(6.9+1.9+3.6)
＝2.5×12.4
＝12.4×2+12.4×0.5
＝24.8+6.2
＝31

Answer 3

7.5×2.3+1.9×2.5+22.5×0.4
=2.5×3×2.3+1.9×2.5+2.5×9×0.4
=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 4

7.5×2.3+1.9×2.5+22.5×0.4
=3×2.5×2.3+1.9×2.5+2.5×0.4+20×0.4
=2.5×（3×2.3+1.9）+2.5×0.4+20×0.4
=2.5×8.8+1+8
=2.5×8+2.5×0.8+9
=20+2+9
=31
=2.5×