99十18=100一1十18=117
47十33=47十30十3=81
87一49=87一（50一1）=87一50十1=38
125一26=125一（25十1）=125一25一1=99
加减法简便计算8道
1. 7 + 8 = 15
2. 12 - 5 = 7
3. 6 + 9 = 15
4. 15 - 6 = 9
5
6 + 9 = 15
7 + 8 = 15
8 = 15
9 = 15
10 = 14
加减法简便计算8道
简便运算题8道
0.9+9.9+99.9+999.9+9999.9
=10.8+99.9+999.9+9999.9
=1110.6+9999.9
=11110.5
8.8×1.25
=（8+0.8）×1.25
=8×1.25+0.8×1.25
=10+1
11
0.125×32×25
=0.125×（4×8）×25
=（0.125×8）×（4×25）
=1×100
=100
9999×2222+3333×3334
=3333×6666+3333×3334
=3333×（6666+3334）
=33330000
20072007×2008-20082008×2007
=2007×10001×2008-2008×10001×2007
=0
123.123×234-234.234×123
=123×1.001×234-234×1.001×123
=0
3.89×4.4+0.611×44
=3.89×4.4+6.11×4.4
=（3.89+6.11）×4.4
=10×4.4
=44
0.111×3.7+0.777×0.9
=0.111×3.7+0.111×6.3
=0.111×（3.7+6.3）
=0.111×10
=1.11