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脱式计算.(能简算的要简算)(1)1.25×8.37×0.8 ...

(1)0.08×720×1.25=0.08×1.25×720=0.1×720=72;(2)5.25×8.2+5.25×0.8+5.25=5.25×(8.2+0.8+1)=5.25×10=52.5;(3)0.125×808=0.125×(8×101)=(0.125×8)×101=1×101=101;(4)18.45-(3.8×2.7+5.3)=18.45-(10.26+5.3)=18.45-15.56=2.89...

(1)(259+259+259+259)×0.25,=(259×4)×0.25,=259×(4×0.25),=259×1,=259;(2)8×4×12.5×0.25,=(8×12.5)×(0.25×4),=100×1,=100;(3)89×[34-(716+0.25)],=89×[34-(716+14)],=89×[34-1116],=89×116,=118;(4)(5-3.7...

(1)1020+270÷18-864,=1020+15-864,=171;(2)23÷0.8×34,=23÷45×34,=23×54×34,=58;(3)18+57+6.875+27,=(18+6.875)+(57+27),=(0.125+6.875)+1,=7+1,=8;(4)0.25×64×125%,=0.25×4×2×8×1.25,=(0.25×4)×(8×1.25)×2,=1×...

(1)1.01+1.01×99,=1.01×(1+99),=1.01×100,=101;(2)1.25×7.85×0.8,=1.25×0.8×7.85,=1×7.85,=7.85;(3)25×32×1.25,=25×4×8×1.25,=(25×4)×(8×1.25),=100×10,=1000;(4)10.1×101,=10.1×(100+1),=10.1×100+1.01×1,=10...

=(1.25+0.1)×4.2×0.8 =(1.25×0.8+0.1×0.8)×4.2 =(10+0.08)×4.2 =10×4.2+0.08×4.2 =42+0.336 =42.336

(1)25.4×1.25×0.8=25.4×(12.5×0.8)=25.4×10=254;(2)3.9÷2×(4.94-3.64)=1.95×1.3=2.535;(3)38.4÷0.25÷4=38.4÷(0.25×4)=38.4÷1=38.4;(4)3.47÷(3.47×4 )=3.47÷3.47÷4=1÷4=0.25;(5)1.25×4.6×8=(1.25×8)×4.6=10×4.6=46;(6...

①0.25×0.975×40=0.25×40×0.975=10×0.975=9.75;②0.89×4.8+0.89×5.2=0.89×(4.8+5.2)=0.89×10=8.9;③(8+0.8)×1.25=8×1.25+0.8×1.25=10+1=11;④10-0.38-0.62=10-(0.38+0.62)=10-1=9;⑤45.3×101-45.3=45.3×(101-1)=45.3×100=4530;⑥1.25×0.2...

①1.258×18.5-0.258×18.5,=18.5×(1.258-0.258),=18.5×1,=18.5;②8.48÷0.8×0.9,=10.6×0.9,=9.54;③1.25×2.4,=1.25×8×0.3,=10×0.3,=3;④5.85÷(1.3+0.5)×6,=5.85÷1.8×6,=3.25×6,=19.5.

(1)13÷0.4÷2.5,=13÷(0.4×2.5),=13÷1,=13;(2)64×4.5+36×4.5,=(64+36)×4.5,=100×4.5,=450;(3)1.25×2.5×0.8,=1.25×0.8×2.5,=1×2.5,=2.5;(4)1.5×101-1.5,=1.5×(101-1),=1.5×100,=150;(5)14.64+3.7×2.8,=14.64+10....

(1)6.72-2.3÷0.5×0.8=6.72-4.6×0.8=6.72-3.68=3.04;(2)98-17+18-67=(98+18)-(17+67)=54-1=14;(3)910÷[12×(65-310)]=910÷[12×910]=910÷920=2;(4)(27+15)×7×5=27×7×5+15×7×5=10+7=17.

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