(1)原式=250×4×29
=1000×29
=29000 (2)原式= 400×25+40×25
=10000+1000
=11000
(3)原式=68-18
=50 (4)原式=808+80
=888
(5)原式=(78+22)×6
=100×6
=600 (6)原式=(39+61)+50
=100+50
=150
(7)原式=9×3
=27 (8)原式=93÷31+31÷31
= 4
(1)原式=250×4×29
=1000×29
=29000 (2)原式= 400×25+40×25
=10000+1000
=11000
(3)原式=68-18
=50 (4)原式=808+80
=888
(5)原式=(78+22)×6
=100×6
=600 (6)原式=(39+61)+50
=100+50
=150
(7)原式=9×3
=27 (8)原式=93÷31+31÷31
= 4