第一章 速算与巧算(B)
     年级     班        姓名     得分     
1.987-178-222-390
2.325+46-125+54
3.567+558+562+555+563
4.67(12+67(35+67(52+67
5.2997(729((81(81)
6.456(2(125(25(5(4(8
7.25(32(125
8.(702-213-414)(3
9.999(99(9
10.21(9+22(9+23(9+24(9
11.1200(25
12.1989(19901990-1990(19891989
13.9999(1111+3333(6667
14.100+99-98+97-96+…+3-2+1
———————————————答 案——————————————————————
1.  197
原式=987-(178+222)-390
    =987-400-400+10
    =197
2.  300
原式=325-125+46+54
    =(325-125)+(46+54)
    =200+100
    =300
3.  2805
原式=560(5+(7-2+2-5+3)
    =2800+5
    =2805
4.  6700
原式=67((12+35+52+1)
    =67(100
    =6700
5.  333
原式=2997(729(81(81
    =(2997(81)((728(81)
    =37(9
    =333
6.  456000000
原式=456((2(5)((25(4)((125(8)
    =456(10(100(1000
    =456000000
7.  100000
原式=(25(4)((8(125)
    =100(1000
    =100000
8.  25
原式=702(3-213(3-414(3
    =234-71-138
    =25
9.  890109
原式=(1000-1)(99(9
    =(99000-99)(9
    =98901((10-1)
    =989010-98901
    =890109
10.  10
原式=(21+22+23+24)(9
    =(21+24)(4(2(9
    =45(4(2(9
    =45((4(2)(9
    =45(2(9
    =90(9
    =10
11.  48
1200(25=(1200(4)((25(4)
       =4800(100
       =48
12.  0
原式=1989(1990(10001-1990(1989(10001
    =0
13.  33330000
原式=3333(3(1111+3333(6667
    =3333(3333+3333(6667
    =3333((3333+6667)
    =3333(10000
    =33330000
14.  150
原式=100+(99-98)+(97-96)+…(3-2)+1
    =100+1+1+…+1+1+1
            49个1
    =100+49+1
    =150

三年级：速算与巧算习题及答案（B）.doc