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72·8÷5·6十14·9用脱式计算是怎样做

(8-9╱4÷1╱3)×9╱5脱式计算 =8*9/5-9/4*3*9/5 =72/5-243/20 =(72*4)/(5*4)-243/20 =288/20-243/20 =45/20 =2.25

① 5 6 × 14 3 ÷ 28 9 ,= 5 6 × 14 3 × 9 28 ,=1 1 4 ;②9÷ 15 8 ÷ 5 6 ,=9× 8 15 × 6 5 ,= 144 25 ,=5 19 25 ;③ 4 7 ÷ 6 5 × 7 15 ,= 4 7 × 5 6 × 7 15 ,= 2 9 ;④ 27 4 × 10 9 × 27 5 ,= 27 4 ×( 10 9 × 27 5 ),= 27 4 × 6,= 81 ...

=5/2*(1/4+1/3)+1/9 =5/2*7/12+1/9 =1/3*(5/2*7/4+1/3) =1/3*(35/8+1/3) =1/3*(35*3+8)/24 =1/3*113/24 =113/72 =1又41/72

1+2-3-4+5+6-7-8+9+.+1990 =(1+2-3-4)+(5+6-7-8)+......+1990 =(-2)+(-2)+....每4个数加减后变成-2,1990/4=497余2,余下的两个数是1989和1990。 =(-2)x497+1989+1990 =2985

(1)96÷(15.4-12.2),=96÷3.2,=30;(2)9÷[0.3×(8-6.5)],=9÷[0.3×1.5],=9÷0.45,=20;(3)0.175÷0.25÷0.4,=0.175÷(0.25×0.4),=0.175÷0.1,=1.75;(4)0.175÷0.25×4,=0.7×4,=2.8;(5)0.36÷[(6.1-4.6)×0.8],=0.36÷[1.5×0.8...

1.1/4 5/6=13/12 7/10-1/4=9/20 3/4-9/20=3/10 2.13÷13/12=12 8/39×3/10=12/195 12/195÷4=3/195 3.12×3/195=36/195

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(1)67.6÷13+8×2,=5.2+16,=21.2;(2)35÷ 7 8 ×1- 2 7 ,=35× 8 7 ×1- 2 7 ,=40- 2 7 ,= 39 5 7 ;(3) 5 6 ×( 2 9 ÷ 5 6 + 5 6 ),= 5 6 ×( 2 9 × 6 5 + 5 6 ),= 5 6 ×( 4 15 + 5 6 ),= 5 6 ×( 16 60 + 50 60 )= 5 6 × 11 10...

(1+99)×99/2

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