2007-03-11 05:25:45 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
2/9 - 1/21 + 1 =
14/63 - 3 /63 + 63/63 =
11/63 + 63/63 =
74/63 =
1 11/63
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2007-03-11 05:36:45 · answer #1 · answered by SAMUEL D 7 · 1⤊ 0⤋
make the denominator equal for all.the smallest is 21x9=189
2/9=42/189
1/21=9/189
1=189/189
thus, 2/9-1/21+1=42/189-9/189+189/189
=222/189=1 11/63
2007-03-11 05:38:08 · answer #2 · answered by llcold 2 · 1⤊ 0⤋
2/9 - (1)/21 + 1 =( 2x21 -9)/9x21 +1 = (42 - 9 +21x9)/21x9 = 222/189 =
2007-03-11 05:34:04 · answer #3 · answered by physicist 4 · 0⤊ 0⤋
2/9-1/21+1
put over the common denominator of 63
14/63-3/63+63/63 = 74/63 or 1.17
2007-03-11 05:29:59 · answer #4 · answered by leo 6 · 1⤊ 0⤋
The common denominator is 63:
14/63-3/63+63/63
11/63+63/63
74/63=1 11/63
2007-03-11 06:20:44 · answer #5 · answered by Anonymous · 0⤊ 0⤋
= 42 / 189 - 9 / 189 + 189 / 189
= 222 / 189
= 1(33/89)
2007-03-11 05:41:24 · answer #6 · answered by Como 7 · 0⤊ 0⤋