tính bằng cách thuận tiện 472 + 544 +58 +12
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![](https://rs.olm.vn/images/avt/0.png?1311)
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715 + 456 + 544 + 285
= (715 + 285) + (456 + 544)
= 1000 + 1000
= 2000
![](https://rs.olm.vn/images/avt/0.png?1311)
\(456+627+100+544+373\)
\(=\left(456+544\right)+\left(627+373\right)+100\)
\(=1000+1000+100\)
\(=2100\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,25\times47\times4\times2=\left(25\times4\right)\times\left(47\times2\right)=100\times94=9400\\ b,865\times99+865=865\times\left(99+1\right)=865\times100=86500\\ c,472\times1002-472-472=472\times\left(1002-1-1\right)=472\times1000=472000\\ d,2478+10275+7522-275=\left(2478+7522\right)+\left(10275-275\right)=10000+10000=20000\)
![](https://rs.olm.vn/images/avt/0.png?1311)
544 + 135 + 157 + 843 + 865 + 456 = ( 544 + 456 ) + ( 135 + 865 ) + ( 157 + 834 ) = 1000 + 1000 + 1000 = 3000
![](https://rs.olm.vn/images/avt/0.png?1311)
a; 472 + 54 + 361 + 28
= (472 + 28) + (54 + 361)
= 500 + 415
= 915
b; 817 + 251 + 423 + 349
= (817 + 423) + (251 + 349)
= 1240 + 600
= 1840
a) 472+54+361+28
=(472+28)+(361+54)
= 500+ 415
=915
b)817+251+423+349
=(817+423)+(251+349)
=1240+600
=1840
![](https://rs.olm.vn/images/avt/0.png?1311)
58 x 58 + 52 x 58 – 10
= 58 x (58 + 52 -10)
= 58 x 100
= 5800
![](https://rs.olm.vn/images/avt/0.png?1311)
58 x 58 + 58 x 52 - 58 x10
= 58 x ( 58 - 52 -10)
= 58 x 100
= 5800
tick cho mình nha bạn ^_^
![](https://rs.olm.vn/images/avt/0.png?1311)
TL
= 1086
nhaaaaaaaaaa
HT
\(472+544+58+12\)
\(=\left(472+58\right)+\left(544+12\right)\)
\(=530+556\)
\(=1086\)
_HT_