3X +2(4X +6)= 3(6X-15)-13 3倍+8×12 = 18X-45-13 11X +12 = 18X-58 7X = 70 X = 10 3X-4(2X +5)= 7(X-5)+4(2X +1) 3X-8X-20 = 7X- 35 +8×4 -5X-20 = 15X-31 20倍= 11 X = 11/20
解答:35/36÷7*(4/15÷3/5) 8/13÷7+1/7*6/13 11/13÷[(5/8+3/4)÷5/8]
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