Question

4.5×7.82+20.8×0.45+0.45怎么简便计算？

Answer 1

此题可以运用结合律进行简便计算，原式=0.45×(7.82×10+20.8+1)=0.45×(78.2+20.8+1)=0.45×92=41.4

Answer 2

4.5×7.82+20.8×0.45+0.45
= 4.5×7.82+2.08×4.5+4.5❌0.1
= 4.5×（7.82+2.08+0.1）
4.5❌10
=45

Answer 3

 0.8×0.2= 5.6×3= 0.25×4= 3.1×0.2= 3.2-0.32= 2+2.8= 380-290= 0.35+0.5= 3.1+0.3= 3+0.3= 630÷9= 4.5…

Answer 4

4.5×7.82+20.8×0.45+0.45
＝4.5×7.82+4.5×2.08+4.5×0.1
＝4.5×（7.82+2.08+0.1）
＝4.5×10
＝45

Answer 5

4.5×7.82+20.8×0.45+0.45=78.2×0.45+20.8×0.45+1×0.45=（78.2+20.8+1）×0.45=100×0.45=45