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脱式计算,能简算的要简算(1) 4 5 % ...

(1) 4 5 - 4 5 ÷ 2 3 × 1 2 = 4 5 - 4 5 × 3 2 × 1 2 = 4 5 - 3 5 = 1 5 ;(2)( 2 3 + 4 15 )×15= 14 15 ×15=14;(3)12.87+3.65+1.35=12.87+(3.65+1.35)=12.87+5=17.87;(4)74.6×19+19×25.4=(74.6+25.4)×19=100×19=1900;(5)【...

(1)3.5×0.8+7.5×0.8-80%,=(3.5+7.5-1)×0.8,=10×0.8,=8;(2) 1 5 ÷3+ 4 5 × 1 3 ,=( 1 5 + 4 5 )× 1 3 ,=1× 1 3 ,= 1 3 ;(3)20-(3.84+1.21)×0.4,=20-5.05×0.4,=20-2.02,=17.98;(4)35÷[( 11 6 - 2 3 )×6].=35÷[ 7 6 ...

(1)3.4÷[(1.2+0.5)×5],=3.4÷[1.2×5+0.5×5],=3.4÷[6+2.5],=3.4÷8.5,=0.4;(2)1.9+19.9+199.9+0.3,=1.9+19.9+199.9+(0.1+0.1+0.1),=(1.9+0.1)+(19.9+0.1)+(199.9+0.1),=2+20+200,=222.

(1)49×[34-(716-14)]=49×[34-316]=49×916=14;(2)6.25×0.56+58×3.4+5×18=6.25×0.56+58×3.4+5×18=0.625×5.6+0.625×3.4+0.625=0.625×(5.6+3.4+1)=0.625×10=6.25;(3)6.72-2.3÷0.5×0.8=6.72-4.6×0.8=6.72-3.68=3.04;(4)2007÷200720072...

(1)807×99+807,=807×(99+1),=807×100,=80700;(2) 25× 1 3 × 2 5 × 3 10 ,=(25× 2 5 )×( 1 3 × 3 10 ),=10× 1 10 ,=1;(3)0.6+3.1+5.4+6.9,=(0.6+5.4)+(3.1+6.9),=6+10,=16;(4) [1-( I 2 - 1 4 )]× 2 5 ,=[1- 1 4...

(1)762-408÷4×5,=762-102×5,=762-510,=252;(2)35×27+57×14,=10+10,=20;(3)1.5×[0.02÷(2.1-2.09)],=1.5×[0.02÷0.01],=1.5×2,=3;(4)12.5×8.8,=12.5×(8+0.8),=12.5×8+12.5×0.8,=100+10,=110;(5)87.58-(7.58+3.8),...

五分之四加(八分之三减四分之一)脱式计算能简算的要简算 五分之四加(八分之三减四分之一) =4/5+3/8-1/4 =32/40+15/40-10/40 =(32+15-10)/40 =37/40

(1)44×25,=11×(4×25),根据乘法结合律,=11×100,=1100;(2)(1- 1 4 - 5 12 )÷ 2 3 ,=(1- 3 12 - 5 12 ) ÷ 2 3 ,= 1 3 × 3 2 ,= 1 2 ;(3) 3 5 ×12+ 3 5 ×14- 3 5 ,= 3 5 × (12+14-1),= 3 5 × 25,=15;(4) 4 9 ×[ 3 4 -...

(1)8.6×10.1=8.6×(10+0.1)=8.6×10+8.6×0.1=86+0.86=86.86;(2)9.07-22.78÷3.4=9.07-6.7=2.37;(3)5.6×(12.5-8.5÷0.85)=5.6×(12.5-10)=5.6×2.5=14;(4)150÷2.5+150÷7.5=60+20=80;(5)[(8.1-5.6)×0.9-1]×0.4=[2.5×0.9-1]×0.4=[2...

2/13×16分之31×4/5 =1/13×2分之31×1/5 =130分之31 注: 2/13表示13分之2,4/5表示5分之4

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