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99x78+33x66怎么巧算

99*78+33*66 =99*78+99*22 =99*(78+22) =99*100 =9900

99x78+33x66 =99x78+99x22 =99x(78+22) =99x100 =9900

99x78=(100-1)x78=100x78-1x78=7800-78=7722; 33x66=33x3x22=99x22=(100-1)x22=100x22-22=2200-22=2178. 谢谢采纳!

100*78-78+3*11*6*11

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