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脱式计算(能简算的要简算).(1)25.4×1.25×0.8...

(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)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=910×209=2;(4)6.25×0.56+58×3.4+5×18=0.625×5.6+58×3.4+58=58×5.6+58×3.4+58=58×(5.6+...

(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;(...

0.4×125×25×0.8 =(0.4×25)×(125×0.8) =10×100=1000 1.25×(8+10) =1.25×8+1.25×10 =10+12.5=22.5 9123-(123+8.8) =9123-123-8.8 =9000-8.8 =8991.2 1.24×8.3+8.3×1.76 =8.3×(1.24+1.76) =8.3×3=24.9 9999×1001 =9999×(1000+1) =9999×...

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)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.

①4.5×102, =4.5×(100+2), =4.5×100+4.5×2, =450+9, =459; ②0.85×6.7+3.3×0.85, =(6.7+3.3)×0.85, =10×0.85, =8.5; ③0.25×4.87×4, =(0.25×4)×4.87, =1×4.87, =4.87; ④25.8-1.58×0.65, =25.8-1.027, =24.773. 原理及解决简...

(1)3.2×8+3.2×3-3.2=3.2×(8+3-1)=3.2×10=32;(2)4.8×6.3+2.7×4.8+4.8=4.8×(6.3+2.7+1)=4.8×10=48;(3)(0.7+99×0.7)×3=[0.7×(99+1)]×3=[0.7×100]×3=70×3=210;(4)29×3.8-29×0.8=29×(3.8-0.8)=29×20=580.

(1)19.8×0.54÷0.081=10.692÷0.081=132;(2)0.25×0.32×1.25=0.25×(0.4×0.8)×1.25=(0.25×0.4)×(0.8×1.25)=0.1×0.1=0.01;(3)1.89+8.11×2.5=1.89+20.275=22.165;(4)0.25×201-0.25=0.25×(201-1)=0.25×200=50;(5)8.7×0.99=8.7×(...

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