四年级下册数学100较难口算

题目

四年级下册数学100较难口算
不能太简单,要写得数,100道就可以了,要看的整洁!
写得好的我另外加分.
例如：25×0.5=50

答案

14×0.5=28
12×5=60
15×4=60
10 -80 = -70
20 -64 = -44
30 -48 = -18
28 + 12 -32 = 8
29 + 21 -16 = 34
30 + 30 + 0= 60
31 + 39 + 16 = 86
32 + 48 + 32 = 112
33 + 57 + 48 = 138
34 + 66 + 64 = 164
35 + 75 + 80 = 190
36 + 84 + 96 = 216
37 + 93 + 112 = 242
38 + 102 + 128 = 268
39 + 111 + 144= 294
40 -30 -140 = -130
41 -21 -124 = -104
42 -12 -108= -78
43 -3 -92 = -52
44 + 6 -76 = -26
45 + 15 -60 = 0
46 + 24 -44 = 26
47 + 33 -28 = 52
48 + 42 -12 = 78
49 + 51 + 4 = 104
50 + 60 + 20 = 130
51 + 69 + 36 = 156
52 + 78 + 52 = 182
53 + 87 + 68 = 208
54 + 96 + 84 = 234
55 -45 -200= -190
56 -36 -184 = -164
57 -27 -168 = -138
58 -18 -152 = -112
59 -9 -136 = -86
60 + 0 -120 = -60
61 + 9 -104 = -34
62 + 18 -88 = -8
63 + 27 -72 = 18
64 + 36 -56 = 44
65 + 45 -40 = 70
66 + 54 -24= 96
67 + 63 -8 = 122
68 + 72 + 8 = 148
69 + 81 + 24 = 174
70 -60 -260 = -250
71 -51 -244 = -224
72 -42 -228 = -198
73 -33 -212= -172
74 -24 -196 = -146
这些可以吗