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756x213/27+761x327/27怎么巧算

(10/9x7/8x6/13)÷(3/13x16/7x5/18) =(6/9x10/8x7/13)÷(16/13x5/7x3/18) =(2/3×5/4×7/13)÷(16/13×5/7×1/6) =(5/3×2/4×7/13)÷(1/13×5/7×16/6) =(5/3×1/2×7/13)÷(1/13×5/7×8/3) =(5/3×1/2×7/13)÷(5/3×1/7×8/13) =(1/2×7/13)÷(1/7×8/13)...

11+12+13+⋯+29 =(11+29)*(29-11+1)÷2 =40*19÷2 =380

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