1. 3+( 2 +11) = 3 + (11 + 2
2. 3. (8 + 12 ) = 3. ( 12 +
3. (15+8) + 7 = _ + (8 +
4. 11. (9+2) = 11.9 + 11.
5. 11+ = 11
6. -17 + 17 =
7. { x - · = 1
8. 19 x0=
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1. 3+( 2 +11) = 3 + (11 + 2
2. 3. (8 + 12 ) = 3. ( 12 +
3. (15+8) + 7 = _ + (8 +
4. 11. (9+2) = 11.9 + 11.
5. 11+ = 11
6. -17 + 17 =
7. { x - · = 1
8. 19 x0=
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Answer:
1 .30
2.38
3.80
4?
5?
6?
7?
8.0