Question

0.8x25-8.4x1.6简便方法？

Answer 1

这种有乘除有加减的算式，要找到两个相同的数合并，然后加括号，先算加减再算乘除。这道题有0.8和1.6，虽然不完全一样，但是1.6可以看做0.8*2，所以这个式子变成0.8*25-8.4*2*0.8=0.8（25-16.8）=0.8*8.2=6.56

请采纳谢谢

Answer 2

0.8X25--8.4X1.6
=0.8X25--8.4X0.8X2
=0.8X(25--8.4X2)
=0.8X8.2
=6.56

Answer 3

原题=0. 8*25-0. 8*2*8. 4
=0. 8(25-16. 8)
=0. 8*8. 2
=6.56

Answer 4

0.8X25-8.4X1.6
=0.2X4X25-8.4X2+8.4X0.4
=0.2X100-16.8+3.36
=20-17+0.2+3.36
=3+3.56
=6.56

Answer 5

0.8×25-8.4×0.8×2
=0.8×(25-8.4×2)
=0.8×8.2
=6.56