Question

3.9×0.43+0.39×5.7简算

3.9×0.43+0.39×5.7简算

Answer 1

3.9×0.43+0.39×5.7
＝3.9×0.43+3.9×0.57
=3.9x(0.43+0.57)
=3.9x1
=3.9

Answer 2

=0.39×10×0.43+0.39×5.7
=0.39×4.3+0.39×5.7
=0.39×(4.3+5.7)
=0.39×10
=3.9