小学五年级简算五年级简算 要个我讲明白点: 9.8×1.01=.=.=.

问题描述:

小学五年级简算
五年级简算 要个我讲明白点:
9.8×1.01
=.
=.
=.

9.8*1.01
=9.8*(1+0.01)
=9.8*1+9.8*0.01
=9.8+0.098
=9.898
或者
9.8*1.01
=(10-0.02)*1.01
=10*1.01-0.02*10.1
=10.1-0.202
=9.898

9.8*1.01=9.8*(1+0.01)=9.8*1+9.8*0.01=9.8+0.098=9.898

9.8×1.01
=(10-0.2)×(1+0.01)
=(10×1+10×0.01)-(0.2×1+0.2×0.01)

(10-0.2)*(10+0.1)
=100+1-2-0.02
=98.98

9.8×1.01
=9.8×(1+0.01)
=9.8×1+9.8×0.01 这一步是乘法分配律
=9.8+0.098
=9.898

(10-0.2)*(10+0.1)
100+1-2-0.02
98.98

(1-0.2)(1+0.1)
=10*1+10*0.1-10*0.2-0.2*0.1
=10+1-2-0.02
=8.98