作业帮0.125*80.8怎样简便计算 10.1*1.99怎样简便计算第二题打错了，应是10.1*9.9怎样简便计算
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0.125*80.8怎样简便计算 10.1*1.99怎样简便计算第二题打错了，应是10.1*9.9怎样简便计算
0.125*80.8怎样简便计算 10.1*1.99怎样简便计算
第二题打错了，应是10.1*9.9怎样简便计算
0.125*80.8怎样简便计算 10.1*1.99怎样简便计算第二题打错了，应是10.1*9.9怎样简便计算
0.125*80.8
=0.125*(80+0.8)
=10+0.1
=10.1
10.1*1.99
=(10+0.1)*1.99
=19.9+0.199
=20.099
0.125*80.8
=0.125*(80+0.8)
=0.125*80+0.125*0.8
=10+0.1
=10.1
10.1*1.99
=10*1.99+0.1*1.99
=19.9-0.199
=19.701
0.125*80.8
=0.125*80+0.125*0.8
=10+0.1
=10.1
10.1*1.99
=10*1.99+0.1*1.99
=19.9-0.199
=19.701
0.125×80.8＝1/8×﹙80＋0.8﹚
＝1/8×80＋1/8×0.8
＝10＋0.1
＝10.1
0.125*80.8
=0.125*(80+0.8)
=0.125*80+0.125*0.8
=10+0.1
=10.1
10.1*1.99
=(10+0.1)(10+0.1)
=100-0.01
=99.99
0.125×80.8
=0.125×8×10.1
=1×10.1
=10.1
10.1*9.9
=（10＋0.1）×（10－0.1）
=10²－0.1²
=100－0.01
=99.99