1.14.75-（2又4/7-1又1/4）2.3又5/9-（1又5/9-2/7）3.（4/5+1/4）÷7/3+7/104.0.374÷10/99-0.374+1又1/10×0.3745.75+185×56.0.8×7+4/57.（1/6+2.25-1又2/3）÷3又1/2×1又1/38.〖（0.8-4/15）÷13又1/3+3.76〗×1又2/199.1又3/4×2/7+5又1/

1.14.75-（2又4/7-1又1/4）2.3又5/9-（1又5/9-2/7）3.（4/5+1/4）÷7/3+7/104.0.374÷10/99-0.374+1又1/10×0.3745.75+185×56.0.8×7+4/57.（1/6+2.25-1又2/3）÷3又1/2×1又1/38.〖（0.8-4/15）÷13又1/3+3.76〗×1又2/199.1又3/4×2/7+5又1/
1.14.75-（2又4/7-1又1/4）
2.3又5/9-（1又5/9-2/7）
3.（4/5+1/4）÷7/3+7/10
4.0.374÷10/99-0.374+1又1/10×0.374
5.75+185×5
6.0.8×7+4/5
7.（1/6+2.25-1又2/3）÷3又1/2×1又1/3
8.〖（0.8-4/15）÷13又1/3+3.76〗×1又2/19
9.1又3/4×2/7+5又1/3÷1又1/3-4又1/3
10.3.28+(20.6-16.8÷4.8)×3.2
11.1/5×（3.4+3.4+3.4+3又8/5+3又2/5）
12.9÷〖1-（2/5+9/20）〗÷16
满意加一百分
不过要把过程写的清清楚楚

1.14.75-（2又4/7-1又1/4）2.3又5/9-（1又5/9-2/7）3.（4/5+1/4）÷7/3+7/104.0.374÷10/99-0.374+1又1/10×0.3745.75+185×56.0.8×7+4/57.（1/6+2.25-1又2/3）÷3又1/2×1又1/38.〖（0.8-4/15）÷13又1/3+3.76〗×1又2/199.1又3/4×2/7+5又1/
1.14.75-（2又4/7-1又1/4）
=14+3/4-(2+4/7-1-1/4)
=14+3/4-2-4/7+1+1/4
=14-2+1+3/4+1/4-4/7
=13+1-4/7
=13+3/7
=13又3/7
2.3又5/9-（1又5/9-2/7）
=3+5/9-(1+5/9-2/7)
=3+5/9-1-5/9+2/7
=3-1+5/9-5/9+2/7
=2+2/7
=2又2/7
3.（4/5+1/4）÷7/3+7/10
=（4/5+1/4）*3/7+7/10
=(16+5)/20*3/7+7/10
=21/20*3/7+7/10
=9/20+7/10
=(9+14)/20
=23/20
=1+3/20
=1又3/20
4.0.374÷10/99-0.374+1又1/10×0.374
=0.374*99/10-0.374+1又1/10×0.374
=0.374*9.9-0.374+1.1×0.374
=0.374*(9.9-1+1.1)
=0.374*10
=3.74
5.75+185×5
=5*15+185*5
=5*(15+185)
=5*200
=1000
6.0.8×7+4/5
=0.8*7+0.8
=0.8*(7+1)
=0.8*8
=6.4
7.（1/6+2.25-1又2/3）÷3又1/2×1又1/3
=(1/6+2-1/4-1-2/3)*2/7*4/3
=(1/6+1-1/4-2/3)*2/7*4/3
=(2+12-3-8)/12*8/21
=1/12*8/21
=2/63
8.〖（0.8-4/15）÷13又1/3+3.76〗×1又2/19
=[(4/5-4/15)÷40/3+3.76]×21/19
=[(12-4)/15*3/40+3.76]*21/19
=[8/15*3/40+94/25]*21/19
=(1/25+94/25)*21/19
=95/25*21*19
=19/5*21/19
=21/5
=4+1/5
=4又1/5
9.1又3/4×2/7+5又1/3÷1又1/3-4又1/3
=7/4*2/7+16/3*3/4-4-1/3
=1/2+4-4-1/3
=1/2-1/3
=1/6
10.3.28+(20.6-16.8÷4.8)×3.2
=3.28+(20.6-3.5)*3.2
=3.28+17.1*3.2
=3.28+54.74
=58
11.1/5×（3.4+3.4+3.4+3又8/5+3又2/5）
=1/5*(3.4+3.4+3.4+3.4+4.4)
=1/5*18
=18/5
=3+3/5
=3又3/5
12.9÷〖1-（2/5+9/20）〗÷16
=9÷[1-2/5-9/20]÷16
=9÷[3/20]÷16
=9÷[3/20*16]
=9÷[12/5]
=9*5/12
=15/4
=3+3/4
=3又3/4