a,40.213+163.29+87.40-63.29
=40.7.29+163.29+3.29.40-63.29
=(40.7+163+3.40-63)29
=(280+163+120-63).29
=500.29
=14500
\(a.\)\(40.213+163.29+87.40-63.29\)
\(=40.7.20+163.29+3.29.40-63.29\)
\(=29\left(40.7+163+3.40-63\right)\)
\(=29\left(280+163+120-63\right)\)
\(=29.500\)
\(=14500\)
Đây là tính nha, ko thích thì tính theo thứ tự !
\(b.\)\(140-\left\{\left[50-\left(8-1\right)^2\right]+4^2\right\}\)
\(=140-\left\{\left[50-7^2\right]+16\right\}\)
\(=140-\left\{\left[50-49\right]+16\right\}\)
\(=140-\left\{1+16\right\}\)
\(=140-17\)
\(=123\)
a, \(40.213+163.29+87.40-63.29=40\left(213+87\right)+29\left(163-63\right)\)
\(=40.300+29.100\)
\(=12000+2900\)
\(=14900\)
b, \(140-\left\{\left[50-\left(8-1\right)^2\right]+4^2\right\}=140-\left[50-7^2\right]-16\)
\(=140-16-1\)
\(=123\)
