Question

178×42+79+79×57简便运算？

Answer 1

运用乘法分配律进行简算
178*42+79+79*57
=(100-1+79）*42+79+79*57
=4200-42+79*42+79*58
=4200-42+79*(42+58)
=4200+7900-100+58
=12058

Answer 2

178X42十79十79X57
=178X42十79X58
=10X84十79X84十79X58
=840十79X142
=840十11360一142
=12058

Answer 3

79+79×57=79×58所以=178×42+79×58

Answer 4

=100×42+79×42+79×57+79-42
=4200+79×100-42
=4200+7900-42
=12100-42
=12058