22
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(10+9)+(1−1)+(2−2)+(3−1)+(4−4) = 21This is the same equation rewritten: (10+9)+(3−1) = 21This can be done as 1-1, 2-2, 4-4 cancel themselves out.
9/10 + ½ =9/10 + 2/10 = 11/10 = 1⅒
(10 + 1) x 10/2
2X + 9 = 10 subtract 9 from each side 2X + 9 - 9 = 10 - 9 2X = 1 divide both sides integers by 2 (2/2)X = 1/2 X = 1/2 -----------------check in original equation 2(1/2) + 9 = 10 2/2 + 9 = 10 1 + 9 = 10 10 = 10 --------------checks [ 2(1/2) also cancels to just 1 ]
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 55