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脱式计算,能简算的要简算.(1)250×16H048÷24...

(1)77×376=(76+1)×376,=76×376+1×376,=3+376,=3376;(2)19÷[(34+15)÷12]=19÷[1920×2],=19×1019,=10;(3)( 13+14-16)×24.=13×24+14×24-16×24,=8+6-4,=10.

⑴1/4÷(2/3-3/2×1/3)=3/2 ⑵24×(1/6+3/8+7/12)=27 ⑶1/8×58+1/8×41+1/8=25/2

(1)(13+14?124)×24,=13×24+14×24-124×24,=8+6-1,=13;(2)(1+12)×(1-12)×(1+13)×(1-13)×…×(1+19)×(1-19),=32×12×43×23×…×109×89,=12×109,=59;(3)2007×20052006,=(2006+1)×20052006,=2006×20052006+20052006,=200...

(1)17.4÷0.8÷1.25,=17.4÷(0.8×1.25),=17.4÷1,=17.4;(2)1.8÷0.2÷0.3,=1.8÷(0.2×0.3),=1.8÷0.06,=30;(3)24÷O.6+0.6÷24,=40+0.025,=40.025;(4)17.94÷3.9+5.3×0.4,=4.6+0.12,=4.72.

如图

216÷24 =216÷(6×4) =216÷6÷4 =36÷4 =9

脱式计算,能简算要简算 13/6÷39/14×24/7÷26/5 =13/6×14/39×24/7×5/26 =7/9×24/7×5/26 =3/8×5/26 =15/208

第一组A、列竖式计算: (1)350÷60 (2)780÷26 (3)66×23 (4)895÷35 (5)378÷42 B、混合运算: (1)480-180+60 (2)480-(180+60)(3)360÷40×9 (4)360÷(40×9) (5)90-40×2 第二组A、列竖式计算: (1)614÷80 (2)786÷23 ...

13×3+24÷2 =39+12 =51

24.3-24.3÷4.5 =24.3-5.4 =18.9

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