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806÷25÷4简便运算

解:806减399等于( 407 ) ∵A - B = C ∴806减399 = 806 - 399 = (800 + 6)- (400 - 1) = 800 + 6 - 400 + 1 = (800 - 400)+ (6 + 1) = 400 + 7 = 407 答:806减399等于407

6.586

806-399 =806 - 400 + 1 =406 + 1 =407 希望我的回答对您有帮助,满意请采纳,谢谢。

解:原式=(800+6)x59 =800x59+6x59 =47200+354 =47554 分析:主要考察拆分法的运用。

806x32 =800x32+6x32 =25600+192 =25792

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