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脱式计算,(能简算的要简算) 25×7.6×0.8...

(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;(...

(1)7.6×2.4-0.04=18.24-0.04=18.2 (2)32×12.5×2.5=8×4×12.5×2.5=(8×12.5)×(2.5×4)=100×10=1000 (3)3.572÷0.47×28=7.6×28=212.8 (4)8.25×0.63+0.37×8.25=8.25×(0.63+0.37)=8.25×1=8.25(5)6.21÷0.69÷0.45=9÷0.45=20 (6)47.04÷0....

(1)1.08×0.8÷0.27=1.08÷0.27×0.8,=4×0.8,=3.2;(2)2.6×1.7+1.4×1.7=(2.6+1.4)×1.7,=4×1.7,=6.8;(3)0.4×63×2.5=0.4×2.5×63,=1×63,=63.

(1)0.9×2.5×0.4=0.9×(2.5×0.4)=0.9×1=0.9;(2)1.25×3.4×0.8=1.25×0.8×3.4=1×3.4=3.4;(3)17.8×99=17.8×(100-1)=17.8×100-17.8×1=1780-17.8=1762.2.

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×...

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)6.5×99,=6.5×(100-1),=6.5×100-6.5×1,=650-6.5,=643.5;(2)0.7×9.2+0.7×0.8,=0.7×(9.2+0.8),=0.7×10,=7.

(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)2.72÷[(8.2-6.5)×0.5]=2.72÷[1.7×0.5],=2.72÷0.85,=3.2;(2)9.12+9.12×9-60.2=(1+9)×9.12-60.2,=10×9.12-60.2,=91.2-60.2,=31;(3)28.4÷0.4÷0.25=28.4÷(0.4×0.25),=28.4÷0.1,=284;(4)27.36-27.36÷7.6=27.6-3.6,=24.

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.

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