Question

7.8×25+78×7.5的简便运算怎么写？

Answer 1

把加数和被加数里化作有共同因数7.8，78×7.5=7.8×75，然后提取公因数7.8，
7.8×25+78×7.5
=7.8×25+7.8×75
=7.8×(25+75)
=7.8×100
=780

Answer 2

这道题可以这样解答：
7.8X25+78X7.5
=78X2.5+78X7.5
=78X（2.5+7.5）
=78X10
=780

Answer 3

根据题意可得：
7.8*25+78*7.5
=7.8*25+7.8*75
=7.8*(25+75)
=7.8*100
=780

Answer 4

7.8*25+78*7.5
=78*0.1*25+78*7.5
=78*2.5+78*7.5
=78*（2.5+7.5）
=78*10
=780