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脱式计算,(能简算的要简算) 25×7.6×0.8...

(1)5.45+0.56×7.4,=5.45+4.144,=9.594;(2)2.5×0.89×4,=(2.5×4)×0.89,=10×0.89,=8.9;(3)25×16.7-25×0.7,=25×(16.7-0.7),=25×16,=400;(4)7.6×99,=7.6×(100-1),=7.6×100-7.6,=760-7.6,=752.4;(5)5.6×10.2,=5.6×...

(1)7.6×40.3÷(76×0.8)÷1.25,=7.6×40.3÷76÷0.8÷1.25,=7.6÷76÷(0.8×1.25)×40.3,=0.1×40.3,=4.03;(2) 5 1 5 ÷0.65- 1 5 7 ×0.875,=5.2÷0.65- 12 7 × 7 8 ,=8- 3 2 ,= 13 2 ;(3)(8.6- 7 4 7 )÷ 2 6 7 +7.64,=(8 3 5 - 7 4 7...

(1)0.08×720×1.25=0.08×1.25×720=0.1×720=72;(2)5.25×8.2+5.25×0.8+5.25=5.25×(8.2+0.8+1)=5.25×10=52.5;(3)0.125×808=0.125×(8×101)=(0.125×8)×101=1×101=101;(4)18.45-(3.8×2.7+5.3)=18.45-(10.26+5.3)=18.45-15.56=2.89...

就中间 那 能提一下

(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.

3.08÷0.5÷2 =3.08÷(0.5x2) =3.08÷1 =3.08

(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)17.4÷0.8÷1.25,=17.4÷(0.8×1.25),=17.4÷1,=17.4;(2)1.8÷0.2÷0.3,=1.8÷(0.2×0.3),=1.8÷0.06,=30;(3)24÷O.6+0.6÷24,=40+0.025,=40.025;(4)17.94÷3.9+5.3×0.4,=4.6+2.12,=6.72.

(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...

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