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= 5/8*42/10 - (1/4)² =
= 5/8*21/5 - 1/16 =
= 21/8 -1/16=
= 42/16 -1/16 =
= 41/16
4/7 * (0,2+1,4)=
= 4/7*1,6 =
= 4/7*16/10=
= 4/7* 8/5 =
= 32/35
2⅝-¹/₁₆ =
²¹/₈ - ¹/₁₆ =
⁴²/₁₆ - ¹/₁₆ =
⁴¹/₁₆ =
2⁹/₁₆
4/7 * (0,2+1,4)=
⁴/₇ * 1,6 =
⁴/₇ * ¹⁶/₁₀ =
⁶⁴/₇₀ =
³²/₃₅