10.63-2.53-3.47+8.54.12.5乘6.4 乘0.25能巧算就巧算

10.63-2.53-3.47+8.54
=10.63-（2.53+3.47）+8.54
=10.63-6+8.54
=4.63+8.54
=13.17
12.5乘6.4 乘0.25
=12.5*0.8*8*0.25
=10*2
=20

10.63-2.53-3.47+8.54
=10.63-（2.53+3.47）+8.54
=10.63-6+8.54
=4.63+8.54
=13.17
12.5乘6.4 乘0.25
=12.5×0.8×2×4×0.25
=10×2×（4×0.25）
=20×1
=20
希望能帮到你，@数学辅导团# 祝你学习进步，不理解请追问，理解请及时采纳！(*^__^*)