Toán lớp 6

PHIẾU BT SỐ 25: ÔN TẬPBài 1: Tính tổng sau một cách hợp lí:a)$-7105-\left( {155-7105} \right)+355$b) $\left( {35-815} \right)-\left( {795-65} \right)$c) $5-197-2015-2015$d) $4567=1234-4567-\,\,-66$e) $2004-15+54-2004-54$f) $-45789-357-45789+57$g) $1259-1409-12+1259+1409$h) $2750-1229+2750-\left[ {-438-29-438} \right]$i) $-5+-37-45+151-\,-37+151$k) $53-145-359-53+145-259$l) $-81-132-547+181-132-53$m) $50-2016+50-118+2016-18$n) $254-49-75+254-175+549$p) $173-536+173-\left[ {29-29+526} \right]$q) $ -\left[ {-171+171+223} \right]-\left[ {172-105+172} […]