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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;(...

8/13*1/7+1/7*6/13=1/7(8/13+6/13)=2/13

(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.

①l+O.64÷0.8-0.15,=1+0.8-0.15,=1.8-0.15,=1.65;② 2 11 ×[ 3 4 -( 7 16 - 3 8 )],= 2 11 ×[ 3 4 - 1 16 ],= 2 11 × 11 16 ,= 1 8 ;③ 2 5 ×18+32× 2 5 ,= 2 5 ×(18+32),= 2 5 ×50,=20;④ 1 5 ÷[( 2 3 + 1 5 )× 1 13 ],= 1 5 ÷...

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)7.32-(3.8+1.32),=7.32-1.32-3.8,=6-3.8,=2.2;(2)95.6×18-9535×8,=95.6×18-190.6×8=1720.8-1524.8,=196;(3)(1-16×37)÷56,=(1-114)÷56,=1314×65,=3935;(4)1.5÷[1.2-(0.4+0.5)],=1.5÷[1.2-0.9],=1.5÷0.3,=5;(5...

(1)13.7×0.125×8,=13.7×(0.125×8),=13.7×1,=13.7;(2)0.8×[13-(3.12+5.28)],=0.8×[13-8.4],=0.8×4.6,=3.68;(3)102×0.56,=(100+2)×0.56,=100×0.56+2×0.56,=56+1.12,=57.12;(4)1.53×1.7+0.47×1.7,=(1.53+0.47)×1.7,...

(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×...

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