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脱式计算. (1)49+67+59 (2)34?(56?1...

(1)49+67+59,=49+59+67,=1+67,=167;(2)34-(56-13),=34-12,=14;(3)53?27?57,=53-(27+57),=53-1,=23.

①80-(56+12) =80-68 =12 ②47-(59-49) =47-10 =37

1. 4×102-2×49 =408-2×49 =408-98 =310 2. 25×(2+4) =25×2+25×4 =50+100 =150 3. 12×5+8 =60+8 =68 4. 99×101 =99×(100+1) =99×100+99×1 =9900+99 =9999 5. 25×(78×4) =25×4×78 =100×78 =7800 6. (25+12)×4 =25×4+12×4 =100+48 =148 7. ...

(1)375+450÷18×25,=375+25×25,=375+625,=1000;(2)8.5×3-5.85÷1.3,=25.5-4.5,=21;(3)12-(34-35)÷34,=12-320×43,=12-15,=310;(4)(79+13)÷815×310,=109×158×310,=58.

(1)2091-2091÷17,=2091-123,=1968;(2)(34-34×25)÷15,=34×(1-25)×5,=34×35×5,=94;(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+119×12+719,=5+(1219...

=1.58÷(20-22.1) =1.58÷(-2.1) =-79/105

1/6+1/3+1/2 =1/6+2/6+3/6 =1 8/15+(7/30-1/5) =16/30+7/30-6/30 =17/30 6/7-(1/7+1/2) =6/7-1/7-1/2 =12/14-2/14-7/14 =2/14 9/10-(1/4-1/6) =9/10-1/4+1/6 =54/60-15/60+10/60 =49/60

(1)0.95×27+57×0.95,=0.95×(27+57),=0.95;(2)519?1317?417+1419,=(519+1419)-(1317+417),=1-1,=0;(3)10000÷25÷8÷4,=10000÷(25×8×4),=10000÷800,=12.5;(4)59+79-1.625-2.375+3,=(59+79+3)-(1.625+2.375),=413-4...

(1)4.57+3.34÷0.2=4.57+16.7,=21.27;(2)1.68÷0.25÷0.4=1.68÷(0.25×0.4),=1.68÷0.1,=16.8;(3)2.5×0.7+7.5×0.7=(2.5+7.5)×0.7,=10×0.7,=7;(4)0.125×0.32×0.25=(0.125×0.8)×(0.4×0.25)=0.1×0.1,=0.01.

18.56+(-5.16)+(-1.44)+(+5.16)+(-18.56) =18.56+(-18.56)+(-5.16)+5.16+(-1.44) =0+0-1.44 =-1.44 4.1+(+1/2)+(-1/4)+(-10.1)+7 =4.1-10.1+7+1/2-1/4 =-6+7+1/4 =1+0.25 =1.25

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