78×101
=78×100+1
=7800+1
=7801
粮站运来面粉和大米各200袋,运来面粉和大米一共千克?
76×74-76×24=
15×(6+12)=15×+15×
64×125=
①3000÷125÷8
②65×142-42×65
③99×78+78
④280÷[(31-27)×14]
⑤25×24
⑥432÷54+68×54