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999×3+3+99×8+8+9×2+2+9简便运算怎么算

3X(999+1)十8X(99+1)+2X(9+1)十9=

(1000-1)x3 3 (100-1)x8 8 (10-1)x2 2 9 =1000x3 100x8 10x2 9 =3000 800 20 9 =3829 比较空的地方是加号,手机手打的,加号显示不出来,不好意思哦,望采纳

7.8×99+3.9×2的简便计算 7.8×99+3.9×2 =7.8x99+7.8 =7.8x99+7.8x1 =7.8x(99+1) =7.8x100 =780

3×999+3+99×8+8+2×9+2简便运算 =3x(999+1)+8x(99+1)+2x(9+1) =3x1000+8x100+2x10 =3000+800+20 =3820

原式 =999x3+99x8+9x2+3+8+2+9 =(999x3+3)+(99x8+8)+(9x2+2) =(999+1)x3+(99+1)x8+(9+1)x2 =1000x3+100x8+10x2 =3000x800+20 =3820 供参考。

7.8×99+3.9×2 =7.8×99+7.8 =7.8×(99+1) =7.8×100 =780

3829

999x3+3+99x8+8+9x2+9 =3×(999+1)+8×(99+1)+9×(2+1) =3×1000+8×100+9×3 =3000+800+27 =3827 祝你开心

如图

999又8/9+99又8/9+9又8/9+1/3 =(999又8/9+1/9)+(99又8/9+1/9)+(9又8/9+1/9) =1000+100+10 =1110

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