要简便算法,1:8/9×(9+3/4)-2/3 2:7/8÷2/3+7/8×1/2 3:4-2/5÷8/15-1/44:7/8+2/3÷4/5+1/6 5:6-5/12×9/10-13/8 6:4/5+5/8÷1/4+1/2 7:2-8/9×3/4-1/3 10:4/9+2/7+5/18÷1/2 11:4-8/15÷2/3-1/5

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