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Ta có: 8.19 = 8.(20 – 1) = 8.20 – 8.1 = 160 – 8 = 152
65.98 = 65.(100 – 2) = 65.100 – 65.2 = 6500 – 130 = 6370
![](https://rs.olm.vn/images/avt/0.png?1311)
8.19 = 8.(20-1) = 8.20 - 8 = 160-8 = 152
65.98 = 65.(100-2) = 65.100 - 65.2 = 6500 - 130 = 6370
Đúng nhé bạn !
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a) 125.16 = 125.8.2 = 1000.2 = 2000
25.28 = 25.4.7 = 100.7 = 700
b) 13.12 = 13.(10+2) = 13.10 + 13.2 = 130+26 = 156
53.11 = 53.(10+1) = 53.10+53.1 = 530+53 = 583
39.101 = 39.(100 + 1) = 39.100 + 39.1 = 3900 + 39 = 3939
c) 8.19 = 8.(20 – 1) = 8.20 – 8.1 = 160 – 8 = 152
65.98 = 65.(100 – 2) = 6500 – 130 = 6370
![](https://rs.olm.vn/images/avt/0.png?1311)
8.19 = 8. [ 20 - 1 ] 65.98 = [ 100 -2 ] .65
= 8.20 - 8.1 = 65.100 -65.2
= 160 - 8 = 6500 -130
= 152 = 6370
8x19=8x(20-1)
=8x20-8x1
=160-8
=152
65x98=(100-2)x65
=65x100-130
=6500-130
=6370
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
8 x 19 = 8 x ( 20 - 1 ) = 8 x 20 - 8 x 1 = 160 - 8 = 152
65 x 98 = 65 x ( 100 - 2 ) = 65 x 100 - 65 x 2 = 6500 - 130 = 6470
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
8.19 = 8.(20-1) = 8.20 - 8 = 160-8 = 152
65.98 = 65.(100-2) = 65.100 - 65.2 = 6500 - 130 = 6370
8.19
=8.(20-1)
=8.20-8.1
=160-8
=152
65.98
=65.(100-2)
=65.100-65.2
=6500-130
=6370
8.19=8.(20-1)=160-8=152
65.98=65.(100-2)=6500-130=6370