初中数学题,求过程 7/9×{7/9×[2×(-1)-7]-18}-3×4/9 7/9×{7/9×[2×(-1)-7]-18}-3×4/3
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7/9×{7/9×[2×(-1)-7]-18}-3×4/9
=7/9×[7/9×(-2-7)-18]-4/3
=7/9×[7/9×(-9)-18]-4/3
=7/9×(-7-18)-4/3
=7/9×(-25)-4/3
=-175/9-12/9
=-187/9
7/9×{7/9×[2×(-1)-7]-18}-3×4/3
=7/9×[7/9×(-2-7)-18]-4
=7/9×[7/9×(-9)-18]-4
=7/9×(-7-18)-4
=7/9×(-25)-4
=-175/9-36/9
=-211/9
=7/9×[7/9×(-2-7)-18]-4/3
=7/9×[7/9×(-9)-18]-4/3
=7/9×(-7-18)-4/3
=7/9×(-25)-4/3
=-175/9-12/9
=-187/9
7/9×{7/9×[2×(-1)-7]-18}-3×4/3
=7/9×[7/9×(-2-7)-18]-4
=7/9×[7/9×(-9)-18]-4
=7/9×(-7-18)-4
=7/9×(-25)-4
=-175/9-36/9
=-211/9
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