( 1) 4000÷25
(2) 7.4 1+4.6+2.59+5.4
(3) 18×(2 10-93)÷26
(4) 9. 14-4.57-0.57
(5) 65×35+65×65
(6) 3960÷[ 145-(27+88)]
(7) 64000÷250
(8) 7.84-2.93-0.93
(9) 6.5 1+7.8+3.49+2.2
( 10) 52×(207+93)÷ 13
( 1 1) 47×53+47×47
( 12) 14443÷[ 162-(97-78)]