Câu hỏi của Hải Nguyễn

Question

a) ([ 10 - 2.30 . 5 ] +2.6 ) :2 + (4.5) 2

b)536 .27 - 9 (825 +219) :18 +153   : 152  42 .3

Nguyễn Nam · Accepted Answer

a) $\left[\left(10-2.30.5\right)+2.6\right]:2+\left(4.5\right)^2$

$=\left[\left(10-300\right)+2.6\right]:2+20^2$

$=\left(-290+2.6\right):2+400$

$=\left(-290+12\right):2+400$

$=-278:2+400$

$=-139+400$

$=-\left(139-400\right)$

$=-\left(-261\right)$

$=261$

b) $536.27-9\left(825+219\right):18+15^3:15^2.4^2.3$

$=536.27-9.1044:18+15^3:15^2.4^2.3$

$=14472-9396:18+15^3:15^2.4^2.3$

$=14472-522+15^3:15^2.4^2.3$

$=13920+15^{3-2}.4^2.3$

$=13920+15.4^2.3$

$=13920+15.16.3$

$=13920+240.3$

$=13920+720$

$=14640$Câu trả lời: a) $\left[\left(10-2.30.5\right)+2.6\right]:2+\left(4.5\right)^2$