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77×253怎样巧算

77x24+123×24 =24x(77+123) =24x200 =4800

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

13*271*77 =271x(10x77+3x77) =271x(770+231) =271x1001 =271x1000+271x1 =271271

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

999 乘7.75再+1乘7.75

=44.44×2×11.11+44.44×77.78 =44.44×22.22+44.44×77.78 =44.44×(22.22+77.78) =44.44×100 =4444

=128-28+77-107=100-30=70

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