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脱式计算(能简算要简算) (1)(662×1....

(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.

脱式计算(能简算的要简算) 1.1×11×1.1-1.1×1.1-1.1 =1.1×1.1×(11-1)-1.1 =1.1×1.1×10-1.1 =1.1×11-1.1 =1.1×(11-1) =1.1×10 =11

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)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)4.75+8.4÷(9.2-6.8)=4.75+8.4÷2.4=4.75+3.5=8.25(2)1.2÷[2.5×(4.3-2.7)]=1.2÷[2.5×1.6]=1.2÷4=0.3(3)3.4×5.9+5.9×5.6+5.9=(3.4+5.6+1)×5.9=10×5.9=59

(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)67÷[(47-12)×25]=67÷[114×25]=67÷135=67×35=30;(2)1415×25%-1115÷4=1415×14-1115×14=(1415-1115)×14=15×14=120;(3)1.28×2.37-2.8×0.237=1.28×2.37-0.28×2.37=(1.28-0.28)×2.37=1×2.37=2.37;(4)(512+119)×12+719=512×12+11...

①8.7-3.8×3.5÷1.9,=8.7-3.8÷1.9×3.5,=8.7-2×3.5,=8.7-7,=1.7;②218×9.25+598×374,=218×9.25+598×9.25,=(218+598)×9.25,=10×9.25,=92.5;③3×(215+112)-25,=3×215+3×112-25,=25+14-25,=14;④12+16+112+120+130+142+156+172+190,=1...

(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...

(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...

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