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计算下面各题,能用简便方法算的用简便方法算. ...

380×42+580×38=380×(42+58)=380×100=38000 777×6+111×58=111×(7×6+58)=111×(42+58)=111×100=11100

(1)296+73+104+37,=(296+104)+(73+37),=400+110,=510;(2)1600÷25÷4,=1600÷(25×4),=1600÷100,=16;(3)125×54-46×125,=125×(54-46),=125×8,=1000;(4)50.34+11.645-42.34,=50.34-42.34+11.645,=8+11.645,=19.645;(...

①2.2×3.83+115×5.17+115 =115×3.83+115×5.17+115,=(3.83+5.17+1)×115,=10×115,=22;②2.5×2.4+1.84+5.16=6+(1.84+5.16),=6+7,=13;③7.8÷[32×(1-58)+3.6]=7.8÷[32×38+3.6],=7.8÷[12+3.6],=7.8÷15.6,=0.5;④45×23+15÷34=815+15×43,=...

①2050-630÷42=2050-15=2035; ②12.5×32×2.5=12.5×8×(4×2.5)=100×10=1000;③(5.9+1.65)÷0.5=7.55÷0.5=15.1;④2-34×89 =2-23=113; ⑤716×9-716×7=716×(9-7)=716×2=78;⑥57÷[1÷(23-15)]=57÷[1÷715]=57×715=13.

(1)原式=17.92-7.92-0.3 =10-0.3 =9.7 (2)原式=210÷(14×5) =210÷70 =3 (3)原式= × + × =( + )× = (4)原式= ÷( × ) = ×5 =

解答:11解:(1)13.92-(1.19+9.92)-2.81,=13.92-1.19-9.92-2.81,=(13.92-9.92)-(1.19+2.81),=4-4,=0;(2)(25+16-215)×30,=25×30+16×30-215×30,=12+5-4,=13;(3)55×66÷(11×11),=55×66÷11÷11,=(55÷11)×(66÷11),=5×6...

(1)0.75×99+0.75=0.75×(99+1),=75;(2)56-(23-16)=56+16-23,=13;(3)(8.5-4)×(0.32÷1.6)=4.5×0.2,=0.9;(4)56×[1÷(78?34)]=56×[1÷18],=56×8,=203;(5)0.925×17+9.25×8.3=9.25×1.7+9.25×8.3,=9.25×(1.7+8.3),=9.25×10...

(1)296+73+104+37,=(296+104)+(73+37),=400+110,=510;(2)1600÷25÷4,=1600÷(25×4),=1600÷100,=16;(3)125×54-46×125,=125×(54-46),=125×8,=1000;(4)50.34+11.645-42.34,=50.34-42.34+11.645,=8+11.645,=19.645;...

(1)375+450÷18×25,=375+25×25,=375+625,=1000;(2)195×19+15÷9,=195×19+15×19,=(195+15)×19,=4×19,=49;(3)310÷(52-53)×56,=310÷56×56,=310×(65×56),=310×1,=310;(4)13×(126+211)×22,=(13×22)×(126+211),=(1...

(1)(841-41)÷25×4=800÷25×4=32×4=128;(2)83×29+71×83=83×(29+71)=86×100=8500;(3)101×99=(100+1)×99=100×99+1×99=9900+99=9999;(4)199+199×99=(199+1)×99=200×99=19800;(5)560÷[490÷(34+36)]=560÷[490÷70]=560÷7=80;(...

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