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脱式计算(能简算的要简算).(1)25.4×1.25×0.8...

(1)1.25×8.37×0.8 =1.25×0.8×8.37,=1×8.37,=8.37;(2)(9-2.35)×0.64=6.65×0.64,=4.256;(3)0.25×32×12.5=(0.25×4)×(8×1.25),=1×10,=10;(4)0.15×1999+0.15 =(1+1999)×0.15,=2000×0.15,=300;(5)0.37×1.4-0.4×0.37=(1....

(1)1.08×0.8÷0.27=1.08÷0.27×0.8,=4×0.8,=3.2;(2)102×0.45=(100+2)×0.45,=100×0.45+2×0.45,=45+0.9,=45.9;(3)22.78÷1.25÷0.8=22.78÷(1.25×0.8),=22.78÷1,=22.78;(4)0.34×101-0.34=(101-1)×0.34,=100×0.34,=34.

(1)8×0.4×1.25×2.5,=(8×1.25)×(0.4×2.5),=10×1,=10;(2)72×99,=72×(100-1),=7200-72,=7128;(3)24×(13-18),=24×13-24×18,=8-3,=5;(4)27.4-52.8÷(1.9+2.1),=27.4-52.8÷4,=27.4-13.2,=14.2.

(1)25×7.6×0.8,=(25×0.8)×7.6,=20×7.6,=152;(2)23.7-3.9+6.3-6.1,=(23.7+6.3)-(3.9+6.1),=30-10,=20;(3)2.5×64×1.25,=2.5×(4×8×2)×1.25,=(2.5×4)×(1.25×8)×2,=10×10×2,=200;(4)1÷(1-0.98),=1÷0.02,=50;(...

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)7.8÷1.25÷8=7.8÷(1.25×8)=7.8÷10=0.78(2)0.67×99+0.67=0.67×(99+1)=0.67×100=67(3)3.76×2.9-1.9×3.76=3.76×(2.9-1.9)=3.76×1=3.76(4)2.5×3.2×1.25=(2.5×4)×(0.8×1.25)=10×1=10(5)0.38+9.62÷3.7×5.2=0.38+2.6×5.2=0.38+13...

(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.

(1)3.5×0.8+7.5×0.8-80%,=(3.5+7.5-1)×0.8,=10×0.8,=8;(2)15÷3+45×13,=(15+45)×13,=1×13,=13;(3)20-(3.84+1.21)×0.4,=20-5.05×0.4,=20-2.02,=17.98;(4)35÷[(116-23)×6].=35÷[76×6],=35÷7,=5.

0.25×1.25×4×8脱式计算 =(0.25x4)x(1.25x8) =1x10 =10

(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×...

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