a) 3,24 x 2,6 + 32,4 x 0,47
= 3,14 x 2,6 + 3,24 x 10 x 0,47
= 3,14 x 2,6 + 3,24 x 4,7
= 3,14 x (2,6 + 4,7)
= 3,14 x 7,3
= 22,922
b) tự làm như a
a)3.24x2.6+32.4x0.47
=3.24x10x0.26+32.4x0.47
=32.4x0.26+32.4x0.47
=32.4x(0.26+0.47)
=32.4x0.73
=23.652
b)0.504x154+50.4x0.54
=0.504x100x1.54+50.4x0.54
=50.4x1.54+50.4x0.54
=50.4x(1.54+0.54)
=50.4x2.08
=104.832
a) 3.24 x 2.6 + 32.4 x 0.74
= 3.24 x 2.6 + 32.4 : 10 x 0.74 x 10
= 3.24 x 2.6 + 3.24 x 7.4
= 3.24 x (2.6 + 7.4)
= 3.24 x 10
= 32.4