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77×253怎样巧算

77X253 =80X253-3X253 =2X40X250+80X3-759 =2X10000+240-759 =20000-519 =19481

77×26×97 =77×26×(100-3) =77×2600-77×26×3 =(80-3)×2600-77×78 =80×2600-3×2600-6006 =208000-7800-6006 =200200-6006 =194194

=67x76一66x76一66 =(67一66)X76一66 =76一66 =10

81×77-77+20×77 =(81-1+20)×77 =60×77 =4620 如果我的答案有用请采纳,谢谢哦!

1001除以77的巧算过程如下: 1001÷(7×11) =1001÷11÷7 =91/7 =13 这道题目需要用到数字和11相乘的规律: 一个数与11相乘:两边拉开,两数相加放中间,满十进一。 多位数乘以11:两边拉开,相邻两数相加依次放中间,满十进一。 扩展资料: 乘法...

998×13×77 =998×(7×11×13) =998×1001 =998×(1000+1) =998000+998 =998998 主要是熟悉7×11×13=1001, 这个竞赛里常用.最好你背诵下来哈~~~

(45×12×77)÷(9×6×11) =(5×9×2×6×7×11)÷(9×6×11) =【(9×6×11)×(5×2×7)】÷(9×6×11) =(5×2×7) =70

77×9+11×37 =11×7×9+11×37 =11×(7×9+37) =11×(63+37) =11×100 =1100

38.46 +2.77- 38.46+ 2.77 =(38.46-38.46)+2.77+2.77 =5.54

=(77+133)+(56+44) =110+100 =210

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