二十道简便运算题再加正确的答案。
1) 66x+17y=3967
25x+y=1200
答案：x=48 y=4、(2) 18x+23y=2303
74x-y=1998
答案：x=27 y=79(3) 44x+90y=7796
44x+y=3476
答案：x=79 y=48(4) 76x-66y=4082
30x-y=2940
答案：x=98 y=51(5) 67x+54y=8546
71x-y=5680
答案：x=80 y=59(6) 42x-95y=-1410
21x-y=1575
答案：x=75 y=48(7) 47x-40y=853
34x-y=2006
答案：x=59 y=48(8) 19x-32y=-1786
75x+y=4950
答案：x=66 y=95(9) 97x+24y=7202
58x-y=2900
答案：x=50 y=98(10) 42x+85y=6362
63x-y=1638
答案：x=26 y=62(11) 85x-92y=-2518
27x-y=486
答案：x=18 y=44(12) 79x+40y=2419
56x-y=1176
答案：x=21 y=19(13) 80x-87y=2156
22x-y=880
答案：x=40 y=12(14) 32x+62y=5134
57x+y=2850
答案：x=50 y=57(15) 83x-49y=82
59x+y=2183
答案：x=37 y=61(16) 91x+70y=5845
95x-y=4275
答案：x=45 y=25(17) 29x+44y=5281
88x-y=3608
答案：x=41 y=93(18) 25x-95y=-4355
40x-y=2000
答案：x=50 y=59(19) 54x+68y=3284
78x+y=1404
答案：x=18 y=34(20) 70x+13y=3520
52x+y=2132
答案：x=41 y=50
48x-54y=-3186 24x+y=1080 答案：x=45 y=99
36x+77y=7619 47x-y=799 答案：x=17 y=91 (
13x-42y=-2717 31x-y=1333 答案：x=43 y=78
28x+28y=3332 52x-y=4628 答案：x=89 y=30
62x-98y=-2564 46x-y=2024 答案：x=44 y=54
79x-76y=-4388 26x-y=832 答案：x=32 y=91
63x-40y=-821 42x-y=546 答案：x=13 y=41
69x-96y=-1209 42x+y=3822 答案：x=91 y=78
85x+67y=7338 11x+y=308 答案：x=28 y=74
78x+74y=12928 14x+y=1218 答案：x=87 y=83
=(100+1)×99
=100×99+99
=9999
(2)14×35
=7×2×35
=7×70
=490
(3)25×28
=25×4×7
=100×7
=700
(4)4×9×25
=4×25×9
=100×9
=900
(5)43×5×4
=43×20
=860
(6)15×12
=15×2×6
=30×6
=180
(7)12×(40-5)
=12×40-12×5
=480-60
=420
(8)64×9-14×9
=(64-14)×9
=50×9
=450
(9)35×98
=35×(100-2)
=35×100-35×2
=3500-70
=3430
(10)23×134-34×23
=23×(134-34)
=23×100
=2300
