小学六年级数学简便运算练习题Word文档格式.doc
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17+-71--
加法结合律,连减方法:
a+b+c=a+(b+c),a+b-c=a+(b-c),a-b+c=a–(b-c),a-b-c=a-(b+c);
933-15.7-4.341.06-19.72-20.28
7-3+8+2-11+7+3
乘法交换律,连除方法:
a×
b×
c=a×
c×
b
a×
(b×
c),a×
b÷
(b÷
c),a÷
c=a÷
c),a÷
c),
700÷
14÷
5 18.6÷
2.5÷
0.41.96÷
0.5÷
41.06×
2.5×
4
13×
÷
29÷
125×
8
a+(b+c)=a+b+ca+(b-c)=a+b-ca–(b-c)=a-b+ca-(b+c)=a-b-c;
19.68-(2.68+2.97)5.68+(5.39+4.32)19.68-(2.97+9.68)
7+(-)5-(-)
乘法结合律,连除方法.(a×
b)×
c=a×
c)
c)=a×
c,a×
c,a÷
c)=a÷
c,a÷
c,
1.25×
(8÷
0.5)0.25×
(4×
1.2)1.25×
(213×
0.8)
9.3÷
(4÷
)0.74÷
(71×
)24×
(--+)(12+)×
7
(7-)×
0.92×
1.41+0.92×
8.59×
-×
1.3×
11.6-1.6×
1.3×
11.6+18.4×
9999+999+99+94821-998
3.2×
12.5×
251.25×
883.6×
0.257.6÷
0.25
3.5÷
0.1251.8×
99+1.83.8×
9.9+0.38×
103-×
2-
1.01×
9.6102×
0.872.6×
9.9×
31+
+÷
×
36×
3813.5×
27+13.5×
72+13.5
1.5×
7.4+0.6×
150%+2÷
5.3×
+2.7×
25%0.67×
10.1-6.7
28×
21.6-2.8×
165.6×
1.7+0.56×
83
乘法分配律:
(a+b)×
c+b×
c(a-b)×
c-b×
c隐“1”法.拆分法