乘法分配律五种类型Word文件下载.docx
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c
(a一b)×
c一b×
(40+8)×
25
=40x25+8x25
=1000+200
=1200
125×
(8+80)
=125x8+125x80
=1000+10000
=11000
36×
(100+50)
=100x36+50x36
=3600+1800
=5400
24×
(2+10)
=24x2+24x10
=48+240
=288
86×
(1000-2)
=86x1000-86x2
15×
(40-8)
=40x15-8x15
(60+25)×
4
(36+20)×
5
(25+20)×
4
(100+2)×
47
2×
(11+9)
(25+7)×
类型二:
两个积中相同的因数只能写一次)
a×
c=(a+b)×
c
36×
34+36×
66
=36x(34+66)
75×
23+25×
23
=(75+25)x23
63×
43+57×
63
=63x(43+57)
93×
6+93×
=93x(6+4)
325×
113-325×
13
=325x(113-13)
28×
18-8×
28
=(18-8)x28
类型三:
(提示:
把102看作100+2;
)
78×
102
=78x(100+2)
=78x100+2x78
69×
102
=69x(100+2)
=69x100+2x69
56×
101
=56x(100+1)
=56x100+56x1
52×
=52x(100+2)
类型四:
把99看作100-1;
,再用乘法分配律)
31×
99
=31x(100-1)
=31x100-31x1
42×
98
=42x(100-2)
29×
99
85×
类型五:
把83看作83×
1,再用乘法分配律)
83+83×
=83x(99+1)
=83x100
=8300
56+56×
=56x(99+1)
99×
99+99
=99x(99+1)
101-75
=75x(101-1)
81-125
=125x(81-1)
=125x80
=10000
91×
31-91
=91x(31-1)