1 a,-1/2 + 5/6+1/3 b, -3/8+7/4 -1/2 c, 3/5÷(1/4×7/5) d, 10/11+4/11÷4-1/8  2 B= 5/13×8/15+5/13×26/15-5/13×8/15 3 B= 1/3 ×b+2/9×b-b÷9/4 với b = 9/10

1 a,-1/2 + 5/6+1/3 b, -3/8+7/4 -1/2 c, 3/5÷(1/4×7/5) d, 10/11+4/11÷4-1/8  2 B= 5/13×8/15+5/13×26/15-5/13×8/15 3 B= 1/3 ×b+2/9×b-b÷9/4 với b = 9/10
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