第一章 速算与巧算(A)
     年级     班        姓名     得分     
    1.37+56+63+44
2.284+178
3.89+91+90+92+88+87+93+92+87
4.4996+3993+2992+1991+98
5.1800-90-176-10-24
6.125(13(4(8(25(5(2
7.1999+999(999
8.321(654(987(654(987(321
9.9999(2222+3333(3334
10.1-2+3-4+5-6+…+1991-1992+1993
11.947+(372-447)-572
12.2997(729((81(81)
13.(46+56)((172(4)+14
14.(91(48(75)((25(13(16)
———————————————答 案——————————————————————
1.  200
原式=(37+63)+(56+44)
    =100+100
    =200
2.  462
原式=(300-16)+(200-22)
    =(300+200)-(16+22)
    =500-38
    =462
3.  809
原式=(90-1)+(90+1)+90+(90+2)+(90-2)+(90-3)+(90+3)+(90+2)+(90-3)
    =90(9-1+1+2-2-3+3+2-3
    =810-1
    =809
4.  14070
原式=(5000-4)+(4000-7)+(3000-8)+(2000-9)+(100-2)
    =5000+4000+3000+2000+100-4-7-8-9-2
    =14100-30
    =14070
5.  1500
原式=1800-(90+10)-(176+24)
    =1800-100-200
    =1500
6.  13000000
原式=(125(8)((25(4)((5(2)(13
    =1000(100(10(13
    =13000000
7.  1000000
原式=1000+999+999(999
    =1000+999((1+999)
    =1000+999(1000
    =1000((1+999)
    =1000(1000=1000000
8.  1
原式=(321(321)((654(654)((987(987)
    =1(1(1=1
9.  33330000
原式=3333(3(2222+3333(3334
    =3333(6666+3333(3334
    =3333((6666+3334)
    =3333(10000
    =33330000
10.  997
原式=1+(3-2)+(5-4)+…+(1991-1990)+(1993-1992)
    =1+1(996
    =997
11.  300
原式=947+372-447-572
    =(947-447)-(572-372)
    =500-200
    =300
12. 650000(169(13
原式=650000((169(13)
    =650000(13
    =50000
13.  4400
原式=102(43+14
    =(100+2)(43+14
    =4300+86+14
    =4300+(86+14)
    =4300+100
    =4400
14.  63
原式=91(48(75(25(13(16
    =(91(13)((48(16)((75(25)
    =7(3(3
    =63

三年级：速算与巧算习题及答案（A）.doc