急需300道四年级递等式计算题!要难些,不要有乘除,最好能简便

急需300道四年级递等式计算题!要难些,不要有乘除,最好能简便
要有小数点

23.5+14.8+36.5
=23.5+36.5+14.8
=60+14.8
=74.8
19.4+30.6+45.62
=50+45.62
=95.62
33.5+24.9+51.3
=58.4+51.3
=109.7
39.7×2.8+3.97×72
=3.97×10×2.8+3.97×72
=3.97×28+3.97×72
=3.97×（28+72）
=3.97×100
=397
32×1.2×52
=38.4×52
=1996.8
1.2×2+2.8×2
=【1.2+2.8】×2
=4×2
=8
2.5×2-1.5×2
=[2.5-1.5]×2
=1×2
=2
1.3/7 × 49/9 - 4/3
2.8/9 × 15/36 + 1/27
3.12× 5/6 – 2/9 ×3
4.8× 5/4 + 1/4
5.6÷ 3/8 – 3/8 ÷6
6.4/7 × 5/9 + 3/7 × 5/9
7.5/2 -（ 3/2 + 4/5 ）
8.7/8 + （ 1/8 + 1/9 ）
9.9 × 5/6 + 5/6
10.3/4 × 8/9 - 1/3
11.7 × 5/49 + 3/14
12.6 ×（ 1/2 + 2/3 ）
13.8 × 4/5 + 8 × 11/5
14.31 × 5/6 – 5/6
15.9/7 - （ 2/7 – 10/21 ）
16.5/9 × 18 – 14 × 2/7
17.4/5 × 25/16 + 2/3 × 3/4
18.14 × 8/7 – 5/6 × 12/15
19.17/32 – 3/4 × 9/24
20.3 × 2/9 + 1/3
21.5/7 × 3/25 + 3/7
22.3/14 ×× 2/3 + 1/6
23.1/5 × 2/3 + 5/6
24.9/22 + 1/11 ÷ 1/2
25.5/3 × 11/5 + 4/3
26.45 × 2/3 + 1/3 × 15
27.7/19 + 12/19 × 5/6
28.1/4 + 3/4 ÷ 2/3
29.8/7 × 21/16 + 1/2
30.101 × 1/5 – 1/5 × 21
.用简便方法计算：
(1)3786－499
2)32×25×125
(3)1653－338－662
(4)7987+350+2013+450
(5)38×38+62×38
(6)452+99×452
(7)201×79
(8)50×125×4×8
计算下面各题：
(1)340×(120－40÷8)
(2)45×(720－1957÷19)
(3)86+[4500+(2088÷36)÷2]
(4)396×[74－(4875÷15－13×21)]
(5)[1054－(174－168)]÷8
(6)6048÷[(107－99)×9]
(7) (79+92+121)+108
(8) (37+56+63)+44=
要我的求求你了,我找了好久