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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

806÷(580-9×61) =806÷(580-549) =806÷31 =23

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。

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

原式 =(794+806)x7÷2 =1600x7÷2 =800x7 =5600 或者 =(794+806)+(796+804)+(798+802)+800 =1600+1600+1600+800 =1600x3+800 =4800+800 =5600 供参考。

806-99 =806-(100-1) =806-100+1 =706+1 =707

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

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