Răspuns:
17) a) a×0.25=a÷4
a×1 supra 4 = a÷4supra1
= a supra 4 = a÷4supra1
=a supra 4 = a× 1supra4
a supra 4 = a supra 4
b)
120×0.25=120×25supra100 = 120×1 supra 4=120supra4=30
0.25×3600= 1supra4 × 3600 = 3600supra4=900
4.12×0.25= 412supra100×25supra100
=412supra100×1supra4
=412supra400
9.6×0.25= 96supra10×1supra4=96supra40
