Question

三年级数学巧算

395＋2508＋115,1382－82×15,688－112－88,153÷153＋219×3，﹙567－567﹚÷90,451＋549÷3－95,1000－645－345,125＋75×180,540－240÷12,246÷9×6,680－202＋98,234×98÷49,18×13×150,630×33÷21,2236÷13÷43,6300÷2÷63,888－﹙88＋77﹚，

Answer 1

3x4-1x1=12-1=11平方米
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Answer 2

395＋2508＋115

=395＋115＋2508
=510＋2508
=3018

1382－82×15
=1382－1230
=152

688－112－88
=688-（112+88）
=688-200
=488

153÷153＋219×3
=1+657
=658

﹙567－567﹚÷90
=0÷90
=0

451＋549÷3－95
=451＋183－95
=539

1000－645－345
=1000-（645+345）
=1000-990
=10

125＋75×180
=125+13500
=13625

540－240÷12
=540-20
=520

246÷9×6
=246×6÷9
=1476÷9
=164

680－202＋98
=680-200-2+100-2
=580-4
=576

234×98÷49
=234×2
=468

18×13×150
=18×150×13
=2700×13
=35100

630×33÷21
=630÷21×33
=30×33
=990

2236÷13÷43
=172÷43
=4

6300÷2÷63
=6300÷63÷2
=100÷2
=50

888－﹙88＋77﹚

=888-88-77
=800-77
=723

Answer 3

395＋2508＋115
=395+115+2508
=510+2508
=3018

1382－82×15
=1382-82+82x14
=1300+820+328
=2120+328
=2448

688－112－88
=688-88-112
=600-112
=488

153÷153＋219×3
=1+219x3
=658

﹙567－567﹚÷90
=0÷90
=0

451＋549÷3－95
=451+549-2x549÷3-95
=1000-366-95
=634-100+5
=539

1000－645－345
=1000-(645+345)
=1000-990
=10

125＋75×180
=125+3x25x36x5
=125+125x108
=125x(108+1)
=1000÷8x109
=13625

540－240÷12
=540-20
=520

246÷9×6
=41x2x3÷3÷3x2x3
=41x2x2
=164

680－202＋98
=680-200-2+100-2
=580-4
=576

234×98÷49
=234x(98÷49)
=234x2
=468

18×13×150
=9x2x13x150
=(10-1)x13x150x2
=10x13x300-13x300
=39000-3900
=35100

630×33÷21
=630÷7x33÷3
=90x11
=990

2236÷13÷43
=2236÷(13x43)
=2236÷(10x43+3x43)
=2236÷(430+129)
=2236÷559
=4

6300÷2÷63
=6300÷63÷2
=100÷2
=50

888－﹙88＋77﹚
=888-88-77
=800-77
=723

Answer 4

原式=（33333+1）*44444+33333*44444*2=33333*3*44444+44444=(33333*3+1)*44444=4444400000原式=86*99=86*(100-1)=8600-86=8514