十四道小数巧算 60分 值了吧 第一道：4.75—9.64+8.25—1.36 第二道：3.17—2.74+4.7+5.

1)4.75-9.64+8.25-1.36
=(4.75+8.25)-(9.64+1.36)
=13-11
=2
2)3.17-2.74+4.7+5.29-0.26+6.3
=(3.17+5.29)+(4.7+6.3)-(2.74+0.26)
=8.46+11-3
=16.46
3)(5.25+0.125+5.75)×8
=(5.25+5.75)×8+0.125×8
=11×8+1
=89
4) 34.5×8.23-34.5+2.77×34.5
=(8.23+2.77-1)×34.5
=10×34.5
=345
5)6.25×0.16+264×0.0625+5.2×6.25+0.625×20
=(0.16+2.64+5.2+2)×6.25
=10×6.25
=62.5
6)0.035×935+0.035+3×0.035+0.07×61×0.5
=(935+3+61)×0.035
=999×0.035
=1000×0.035-0.035
=34.965
7)19.98×37—199.8×1.9+1998×0.82
=(3.7-1.9+8.2)×199.8
=10×199.8
=1998
8)13.5×9.9+6.5×10.1
=13.5×10-13.5×0.1+6.5×10+6.5×0.1
=(13.5+6.5)×10-1.35+0.65
=200-0.7
=199.3
9)0.125×0.25×0.5×64
=(1/8)×(1/4)×(1/2)×64
=(1/64)×64
=1
10)11.8×43-860×0.09
=11.8×43-43×20×0.09
=(11.8-1.8)×43
=10×43
=430
11)32.14+64.28×0.5378×0.25+0.5378×64.28×0.75-8×64.28×0.125×0.5378
=32.14+(0.25+0.75-8×0.125)×0.5378×64.28
=32.14+0×0.5378×64.28
=32.14
12)0.888×125×73+999×3
=125×0.8×73+125×0.08×73+125×0.008×73+1000×3-3
=(100+10+1)×73+3000-3
=8103+3000-3
=11100
13)1998+199.8+19.98+1.998
=2000-2+200-0.2+20-0.02+2-0.002
=2222-2.222
=2219.778
14) 1000.[总共2000个0]×a=12500 1000.[总共2000个0]×b=8
a+b=0.000...[总共1996个0]12508
a-b=0.000...[总共1996个0]12492
a×b=0.000...[总共3993个0]1
a÷b=1.25÷0.0008=1562.5