Question

oblicz 4,2-1i1/9= ,5,2*2/7= ,0,65:6i1/2 =, 5/8*4,2-(1/4)do potegi2 ,(1i2/5+0,5):2= ,3,6-1i1/2= ,0,6:2/3= , 4,5-3/4*1/3= 4/7*(0,2+1/4)=

Answer 1

4,2-1i1/9=42/10-10/9=378/90-100/90=278/90=3i8/90=3i4/45
5,2*2/7=52/10*2/7=52/35=1i17/35
0,65:6i1/2 =65/100:13/2=65/100*2/13=65/650=0,1
5/8*4,2-(1/4)^2=5/8*42/10-1/16=42/40-5/80=84/80-5/80=79/80

(1i2/5+0,5):2=(1i4/10+5/10):2=(1i9/10):2=19/20

3,6-1i1/2=3,6-1,5=2,1

0,6:2/3=3/5*3/2=9/10

4,5-3/4*1/3=4,5-1/4=4,5-0,25=4,25

4/7*(0,2+1/4)=4/7*(0,2+0,25)=4/7*0,45=4/7*45/100=4/7*9/20=9/35

Answer 2

4,2 - 1¹/₉ = 4⅕ - ¹⁰/₉ = ²¹/₅ - ¹⁰/₉ = ¹⁸⁹/₄₅ - ⁵⁰/₄₅ = ¹³⁹/₄₅ = 3⁴/₄₅

5,2 · ²/₇ =5⅕ · ²/₇ = ²⁶/₆ · ²/₇ = ²⁶/₂₁ = 1⁵/₂₁

0,65 : 6½ = ¹³/₂₀ : ¹³/₂ = ¹³/₂₀ · ²/₁₃ = ¹/₁₀

⅝ · 4,2 - (¼)² = ⅝ · 4½ - ¹/₁₆ = ⅝ · ⁹/₂ - ¹/₁₆ = ⁴⁵/₁₆ - ¹/₁₆ = ⁴⁴/₁₆ = 2¾

(1⅖ + ½):2 = (⁷/₅ + ½)·½ = (¹⁴/₁₀ + ⁵/₁₀)·½ = ¹⁹/₁₀ · ½ = ¹⁹/₂₀

3⅗ - 1½ = ¹⁸/₅ - ³/₂ = ³⁶/₁₀ - ¹⁵/₁₀ = ²¹/₁₀ = 2¹/₁₀

⅗ : ⅔ = ⅗ · ³/₂ = ⁹/₁₀

4½ - ¾ · ⅓ = ⁹/₂ - ¼ = ¹⁸/₄ - ¼ = ¹⁷/₄ = 4¼

⁴/₇ ·(0,2+0,25)= ⁴/₇ · 0,45 = ⁴/₇ · ⁹/₂₀ = ⁹/₃₅