3道初一的题,马上就要!
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3道初一的题,马上就要!
1.= 90 + 1/4 * 24 + 1/4 * 1/2 - 1/4 * 5 - 1/4 * 1/2 = 96 - 5/4 = 94 3/4
2.= ab/7 - b/2 - a^2 = -8 + 4 - 49 = -53
3.= 3/4 x (7/23 + 4 7/23) - (3/2 x (-3)) = 3/4 x (4 14/23) + 9/2 = 3 + 21/46 + 4 1/2 = 7 22/23
2.= ab/7 - b/2 - a^2 = -8 + 4 - 49 = -53
3.= 3/4 x (7/23 + 4 7/23) - (3/2 x (-3)) = 3/4 x (4 14/23) + 9/2 = 3 + 21/46 + 4 1/2 = 7 22/23