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脱式计算(能简算要简算) (1)(662×1....

1、①6.54×1.2-1.87 =7.848-1.87 =5.978; ②86.4÷0.24+40 =360+40 =400; ③0.46×1.9+0.54×1.9 =1.9×(0.46+0.54) =1.9×1 =1.9; ④13.65÷0.25÷4 =13.65÷(0.25×4) =13.65÷1 =13.65. 2、其中③ ④可以用简便方法。 3、③的简便方法:乘法分配率:(...

(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)2.5×(1.9+1.9+1.9+1.9),=2.5×(1.9×4),=2.5×4×1.9,=10×1.9,=19;(2)19×99+99,=(19+1)×99,=20×99,=1980;(3)2.5×13×0.4,=(2.5×0.4)×13,=1×13,=13;(4)112÷(14+16),=112÷(312+212),=112÷512,=112×125,=15.

(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)8470-104×65,=8470-6760,=1710;(2)168.1÷(4.3×2-0.4),=168.1÷(8.6-0.4),=168.1÷8.2,=20.5;(3)(4÷7+15)×5-197,=(47+15)×5-197,=207+1-197,=207-197+1,=17+1,=117;(4)1110÷[56×(37-38)],=1110÷[56×37-56×38],...

1,80.4-0.2=80.2 2,3.8x1/8+1.2x1/8 =1/8x(3.8+1.2) =1/8x5 =5/8 请采纳,你的采纳是我上进的动力!可以追问,一直到懂!!

(1)(66-32×1.2)÷0.25,=(66-38.4)÷0.25,=27.6÷0.25,=110.4,(2)10×34+17×75%-7×0.75,=10×0.75+17×0.75-7×0.75,=(10+17-7)×0.75,=20×0.75,=15,(3)0.25×[515×(3-2.5×78)],=0.25×[515×(3-3516)],=0.25×[515×1316],=14×26...

(1)7.86+534+1.14+14=(7.86+1.14)+(534+14),=9+6,=15;(2)9511-(3.75+4511),=9511-4511-3.75,=5-3.75,=1.25;(3)335+625÷35×10-910=335+25×10-910,=335+4-910,=735-910,=6710;(4)7684×101-7684=(100+1)×7684-7684,=10...

(1)4右?4右÷23×12=4右?4右×32×12=4右?3右=1右;(2)(23+41右)×1右=141右×1右=14;(3)12.80+3.6右+1.3右&nbs的;&nbs的;&nbs的;&nbs的;&nbs的;&nbs的;&nbs的;&nbs的;&nbs的;=12.80+(3.6右+1.3右)=12.80+右&nbs的;&nbs的;&nbs的;&nbs的;&n...

①2009×97.75+4018×1.125,=2009×97.75+2009×2×1.125,=2009×(97.75+2.25),=2009×100,=200900;②4.02×8.1× 3 5 ÷(0.6×0.81),=4.02×8.1×0.6÷0.6÷0.81,=4.02×(8.1÷0.81)×(0.6÷0.6),=4.02×10×1,=40.2;③9999×8888÷6666,=9999×8×1111...

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