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脱式计算: (1)516÷12+67 (2)[23+(710?1...

(1)516÷12+67=43+67,=110;(2) [ 2 3 +( 7 10 - 1 6 )]÷ 4 5 =[ 2 3 + 16 30 ]× 5 4 ,= 6 5 × 5 4 ,= 3 2 ;(3) (1÷ 1 4 + 1 4 ÷1)×8 =(4+ 1 4 )×8,=4×8+ 1 4 ×8,=32+2,=34.

(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...

(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.

(1)10+17×6÷3 =10+102÷3=10+34=44; (2)176-640÷8-25=176-80-25=96-25=71;(3)144÷(60-8×6)=144÷(60-48)=144÷12=12;(4)67+72÷(21-18)=67+72÷3=67+24=91.

?两位数乘法数字 (1)94×8 =(2)57×6 =(3)9×67 = (4)26×9 =(5)41的第四年×9 =(6)57×3 = (7)7×79 =(8)62×5 =(9)21×1 = (10)3×57 = (11)5×84 =(12)8×26 = (13)5×67 =(14)37×4 =(15)8×98 = (16) (19)9×75 =(20)...

408-12×24 = 408 - 288 = 120 (46+28)×60 = 74 x 60 = 4440 42×50-17 = 2100- 17 = 2083 32+105÷5 = 32 + 21 = 53 420×(327-238) = 420 x 89 = 37380 (4121+2389)÷7 = 6510 ÷7 = 930 3.416÷(0.016×35) = 3.416 ÷0.56 = 6.1 0.8×[(10...

(1)(336-87)×18,=249×18,=4482;(2)(50+59)×48,=109×48,=5232;(3)37×(248-42),=37×206,=7622;(4)12×(702-188),=12×514,=6168;(5)208×30+67,=6240+67,=6307;(6)50-50÷5+6,=50-10+6,=46.

(1)[25-(12-14)×12]÷512,=[25-14×12]÷512,=(25-3)÷512=22÷112,=4;(2)817×29+717×89,=817×29+817×79,=(29+79)×817,=1×817,=817;(3)99×101,=99×(100+1),=99×100+99×1,=9900+99,=9999;(4)1.25×32×2.5,=1.25×(4×8)...

0.4×125×25×0.8 =(0.4×25)×(125×0.8) =10×100=1000 1.25×(8+10) =1.25×8+1.25×10 =10+12.5=22.5 9123-(123+8.8) =9123-123-8.8 =9000-8.8 =8991.2 1.24×8.3+8.3×1.76 =8.3×(1.24+1.76) =8.3×3=24.9 9999×1001 =9999×(1000+1) =9999×...

3.29+0.73+2.27 3.29-0.73-2.27 7.5+2.5-7.5+2.5 7.325-3.29-3.325 7.325-(5.325+1.7) 7.325-(5.325-1.7) 3.29+0.73-2.29+2.27 3.29×0.25×4 0.125×8.8 0.25×0.28 0.125×3.2×2.5 35×40.2 0.25×4÷0.25×4 3.5×9.9 3.5×99+3.5 3.5×101-3.5 3.5×9.9+3...

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