Question

7.8×3.5 0.78×65怎样简便计算？

Answer 1

7.8×3.5+0.78×65怎样简便计算？

7.8×3.5+0.78×65
=0.78×35+0.78×65
=0.78×（35+65）
=0.78×100
=78

Answer 2

简便运算主要是通过交换律、结合律，将相关数字交换结合，凑成整数，达到速算目的。
7.8×3.5+0.78×65
=7.8×3.5+7.8×6.5
=7.8×(3.5+6.5)
=7.8×10
=78

Answer 3

7.8×3.5+0.78×65
=7.8×3.5+7.8×6.5
=7.8x(3.5+6.5)
=7.8x10
=78

Answer 4

7.8x3.5+0.78x65
=0.78x10x3.5+0.78x65
=0.78X（35+65）
=0.78x100
=78

Answer 5

解:好像中间掉了加号
7.8x3.5+0.78x65
=7.8*3.5+7.8*6.5
=7.8*(3.5+6.5)
=7.8*10
=78