Question

Calculati: [4,(1) x 0,9-1,(6) x1,5]:0,04= ? b) [2,(3) x0,3+7,1x4,5]:1,2=?

Answer 1

4,(1)=4intregi si 1/9=37/9 37/9×9/10=37/10 1,(6)=1 intreg si 6/9=15/9=5/3 5/3×15/10=5/3×3/2=5/2 37/10-5/2=37/10-25/10=12/10=6/5 0,04=4/100 6/5÷4/100=6/5×100/4=6/5×25=30 b)2,(3)×0,3=2 intregi si 3/9×3/10=21/9×3/10=7/3×3/10=7/10 7,1×4,5=71/10×45/10=3195/100 7/10+3195/100=70/100+3195/100=3265/100 3265/100÷1,2=653/20÷12/10=653/20×10/12=653/2×1/12=653/24