如题所述
第1个回答 2019-12-23
(1)(8+40)×25
=8×25+40×25
=200+1000
=1200;
(2)61×36+39×36
=(61+39)×36
=100×36
=3600;
(3)34×102
=34×(100+2)
=34×100+34×2
=3400+68
=3468;
(4)72×125
=9×8×125
=9×(8×125)
=9×1000
=9000.
=8×25+40×25
=200+1000
=1200;
(2)61×36+39×36
=(61+39)×36
=100×36
=3600;
(3)34×102
=34×(100+2)
=34×100+34×2
=3400+68
=3468;
(4)72×125
=9×8×125
=9×(8×125)
=9×1000
=9000.