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5.2×10.1简便计算

(5十0.2)X(10十0.1)=50十0.5十2十0.02二52.52

5.2×10.1 =5.2×10+5.2×0.1 =52+0.52 =52.52

5.2×10.1 =5.2×(10+0.1) =52+0.52 =52.52

如图

1-3/10+2/5怎么简便运算 =1+(2/5-3/10) =1+1/10 =1又1/10

5分之3+10分之1-5分之2 =5分之3-5分之2+10分之1 =5分之1+10分之1 =10分之2+10分之1 =10分之3

2.25乘10.1简便运算 =2.25x(10+0.1) =2.25x10+2.25x0.1 =22.5+0.225 =22.725

9/10+1/2+2/5 =9/10+5/10+4/10 =18/10 =9/5

( 1/10 + 3/5 )( 2/9 - 2/15 ) = 1/5 X ( 1/2 + 3 )( 1/3 - 1/5 ) X 2/3 = ( 1/3 + 2 )( 1/15 - 1/25 ) = ( 1/3 + 6/3 )( 5/75 - 3/75 ) = 7/3 X 2/75 = 21 / 225 ( 10/1 + 5/3 )( 9/2 - 15/2 ) = 5 X ( 2 + 1/3 )( 3 - 5 ) X 3/2 = 15/2 X 7/3 ...

你好:第一题原式=(1/2)×(1+2+3+4+5+6+7+8+9+10) =(1/2)×[(1+10)×10÷2] =55/2 第二题第1个空格可填1/12,2/12,3/12,4/12??????10/12 则第2个空格需填10/12,9/12,8/12,7/12??????1/12 (一一对应)因此可以知道第一个空格是一个公差为1/12的...

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