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12 3/7+0,3*5/6= 12 3/7 +3/10 *5/6= 12 3/7 + 1/4=12 12/28 +7/28= 12 19/28
w mnożeniu ułam. skracaj to bardzo ulatwia obl.
= 2/9 * 4 i 5/10 - 1/7=
= 2/9 * 45/10 - 1/7=
= 1/1 * 5/5 - 1/7=
= 5/5 - 1/7=
= 1 - 1/7=
= 6/7
12 i 3/7 + 0,3 * 5/6=
= 12 i3/7 + 3/10 * 5/6 =
= 12 i 3/7 + 1/2 * 1/2=
= 12 i 3/7 + 1/4=
= 12 i 12/28 + 7/28=
= 12 i 19/28