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24.8+4.615.4(0+4) 299999999999+99+94189+35+21653457651125428+(72+19)8539492(26)2243+2624691323169139101129124251455-1325651+8+56853941625191252532158 112009+(29116) 加法互换律:ab=ba 加法结合律:(ab)+ca(+)乘法互换律:ab 乘法结合律:(ab)c=a(bc)乘法分派律:(a+)cac+c 或a(b+c)ab+c减法的性质:a-c=a(c)带着加减号搬家:b-ca-c-ba-bc=a-b abc=c+b 996 9852+456+547592512251625248525458415114253261525882125812139+139199+91399+3899+8849914269265101-5610-65710191039231123852185217281246312376+387422512533+67331835235657+431617272146-2463132328344-2454525-13253832-3289315131529994