299x33十33简便计算
299x33十33简便计算 -
299x33十33 =（299+1）x33 =300×33 =9900
用简便算法计算222x3x333 =222x999 =222x1000-222 =222000-222 =221778
299x33十33 =（299+1）x33 =300×33 =9900
用简便算法计算222x3x333 =222x999 =222x1000-222 =222000-222 =221778
=33.3x(0.3x22.2+3.34)=33.3x(6.66+3.34)=33.3x10 =333 1/3+1/15+1/35+1/63+1/99+1/143 =1/3+1/(3x5)+1/(5x7)+1/(7x9)+1/(9x11)+1/(11x13)=1/3+1/2*(1/3-1/5)+1/2*(1/5-1/7)+1/2*(1/7-1/9)+1/2*(1/9-1/11)+1/2*(1/11-1/13还有呢？
19. 甲仓库存大米500袋，乙仓库存大米200袋，现从两个仓库里运走同样袋数的大米，结果甲仓库剩下大米正好是乙仓库剩下大米的3倍。问从两个仓库里各运走多少袋大米？[50]20. 两筐重量相等的苹果，甲筐卖出7千克，乙筐卖出19千克以后，甲筐余下的千克数是乙筐的3倍，两筐苹果各有多少千克？[25]21. 甲桶的酒是等我继续说。
简便计算:9.99x22.2+33.3x3.34 1/3+1/15+1/35+1/63+1/99+1/143_百度...
简便计算：9.99x22.2+33.3x3.34 1/3+1/15+1/35+1/63+1/99+1/143 9.99x22.2+33.3x3.34 =0.3x33.3x22.2+33.3x3.34 =33.3x(0.3x22.2+3.34) =33.3x(6.66+3.34) =33.3x10 =333 1/3+1/15+1/35+1/63+1/99+1/143 =1/3+1/(3x5)+1/(5x7)+好了吧！
2、22x9、99十3、33x3、34 =6.66×3.33+3.33×3.34 =3.33×（6.66+3.34）3.33×10 =33.3
简便计算:9.99x22.2+33.3x3.34 1/3+1/15+1/35+1/63+1/99+1/143_百度...
22+33.3x3.34 =33.3×6.66+33.3x3.34 =33.3（6.66+3.34 ）33.3×10 =333 2 1/3+1/15+1/35+1/63+1/99+1/143 =1/2(1/1-1/3)+1/2(1/3-1/5)+1/2(1/5-1/7)+1/2(1/7-1/9)+1/2(1/9-1/11)+1/2(1/11-1/13)=1/2(1/1-1/13)=6/13 等我继续说。
原式=333x3.37+999x2.21 =333x3.37+333x3x2.21 =333x3.37+333x6.63 =333x(3.37+6.63)=333x10 =3330 供参考。
50道四年级简便运算题及答案是什么? -
如；302+76=300+76+2，298-188=300-188-2，等。（七）认真观察某项为0或1的运算。如：7.93+2.07×(4.5-4.5)等。总的说来，简便运算的思路是：（1）运用运算的性质、定律等。（2）可能打乱常规的计算顺序。（3）拆数或转化时，数的大小不能改变。（4）正确处理好每一步的衔接。
解： 89*33十3*11 =89*33+33 =(89+1)*33 =90*33 =2970