Question

0.78乘98 简便计算

Answer 1

0.78*98
=0.78*（100-2）
=0.78*100-0.78*2
=78-1.56
=76.44
拆分，然后再运用乘法分配律，分别相乘，凑整，简便运算

Answer 2

0.78✘98
=0.78✘（100-2）
=0.78✘100-0.78✘2
=78-1.56
=76.44

Answer 3

简便计算过程如下，原式＝0.78×（100-2）＝0.78×100-0.78×2＝78-1.56=76.44

Answer 4

0.78 x 98
=0.78 x (100－2)
=0.78x100－0.78x2
=78－(0.8－0.02)x2
=78－0.8x2 + 0.02x2
=78－1.6+0.04
=76.4+0.04
=76.44

Answer 5

0.78X98
=0.78X(100-2)
=0.78ⅹ100-0.78X2
=78-1.56
=78-2+0.44
=76+0.44
=76.44