a) 12.3 x 3.12 + 12.3 x 6.88
= 12.3 x ( 3.12 + 6.88 )
= 12.3 x 10
= 123
b) 2.23 x 8.56 + 8.56 x 7.77
= ( 2.23 + 7.77 ) x 8.56
= 10 x 8.56
= 85.6
c) 4.98 x 67.34 + 32.66 x 4.98
= 4.98 x ( 67.34 + 32.66 )
= 4.98 x 100
= 498
Bài 2 : Tự làm nha
A 12,3+(3,12+6,88)=12,3+10
=123
Bài 1:
a, 12,3 x 3,12 + 12,3 x 6,88 = 12,3 x ( 3,12 + 6,88 ) = 12,3 x 10 = 123
b, 2,23 x 8,56 + 8,56 x 7,77 = 8,56 x ( 2,23 + 7,77 ) = 8,56 x 10 = 85,6
c, 4,89 x 67,34 + 32,66 x 4,98 = 4,98 x ( 67,34 + 32,66 ) = 4,98 x 100 = 498
a) 12,3 *(3,12 + 6,88)
= 12,3 * 10
= 123
b) 8,56 * (2,23 + 7,77)
= 8,56 * 10
= 85,6
c) 4,98 * (67,34 + 32,66)
= 4,98 * 100
= 498