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脱式计算,能简算的要简算.0.8×0.25×4×0.5;4.6×[...

(1)0.8×0.25×4×0.5=(0.8×0.5)×(4×0.25)=0.4×1=0.4;(2)4.6×[3÷(1.45-1.05)]=4.6×[3÷0.4]=4.6×7.5=34.5;(3)55×9.9=55×(10-0.1)=55×10-55×0.1=550-5.5=544.5;(4)4.87×2.34+4.87×7.66=4.87×(2.34+7.66)=4.87×10=48.7.

(1)0.125×0.25×8×4=(0.25×4)×(0.125×8)=1×1=1;(2)54×(56-29 )=54×56-54×29=45-12=33;(3)35×13+35÷113=35×13+35×13=35×(13+13)=35×26=785;(4)8.05-0.75-14=8.05-0.75-0.25=8.05-(0.75+0.25)=8.05-1=7.05.

①12.5×0.4×2.5×8=(12.5×8)×(0.4×2.5)=100×1=100②9.5×101=9.5×(100+1)=9.5×100+9.5=959.5③43.2-1.8×3-4.6=43.2-5.4-4.6=43.2-(5.4+4.6)=33.2④4.2×7.8+2.2×4.2=4.2×(7.8+2.2)=4.2×10=42⑤0.87×3.16+4.64=2.7492+4.64=7.3892⑥12.5×4.8=12....

(1)0.125×0.25×8×4,=(0.125×8)×(0.25×4),=1×1,=1;(2)6.6×12+8×6.6,=6.6×(12+8),=6.6×20,=132;(3)[5-1.7÷(2-1)]×1,=[5-1.7÷1]×1,=[5-1.7]×1,=3.3×1,=3.3;(4)20×2.5÷(10×0.7+3),=20×2.5÷(7+3),=20×2.5÷10,=50...

(1)6.8×0.75÷0.5,=68×(0.75÷0.5),=68×1.5,=102;(2)13.5÷2.5-2.75,=5.4-2.75,=2.65;(3)0.125×0.25×32,=0.125×0.25×4×8,=(0.125×8)×(0.25×4),=1×1,=1;(4)0.9+9.9+99.9+0.3,=(1-0.1)+(10-0.1)+(100-0.1)+0.3,=1...

(1)2.5×1.37×0.4,=2.5×0.4×1.37,=1×1.37,=1.37;(2)4.8×0.25,=1.2×4×0.25,=1.2×(4×0.25),=1.2×1,=1.2;(3)0.89×4.8+0.89×5.2,=0.89×(4.8+5.2),=0.89×10,=8.9;(4)101×0.78,=(100+1)×0.78,=100×0.78+1×0.78,=78+0.78...

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)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....

第一个3.4 第二个3.78

脱式计算能简算的要简算 0.25x32x12.5 =(0.25×4)×(8×12.5) =1×100 =100 2/5x68+0.4x32 =0.4×(68+32) =0.4×100 =40 14/5÷(14/5+7/10) =14/5÷7/2 =4/5 (2/3+4/15x5/6)÷10/21 =(2/3+2/9)÷10/21 =8/9÷10/21 =28/15 1-5/8÷25/28-3/10 =1-...

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