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(¼)²=1/16
-1 1/2 * 3 2/3 = -3/2*11/3=-11/2 = -5 1/2
-7 1/3 : -1 2/9 =-22/3 : (-11/9) = 22/3 * 9/11 = 6
4/5 + -1 1/5 : 2 2/5 + 3/8 * -1 3/5 =
4/5 + (-1 1/5) : 12/5 + 3/8 * (-8/5)=
4/5 + (-6/5)*5/12 - 3/5 =
4/5 - 1/2 + 3/5 = 8/10 - 5/10 - 6 /10=
-3/10