Question

1.234*56.78-5.678*2.34

Answer 1

因为1.234×56.78=5.678×12.34，所以原式等于5.678×12.34-5.678×2.34，运用乘法分配律逆运算可以得到5.678×（12.34-2.34）=56.78

Answer 2

1.234*56.78-5.678*2.34
=1.234×56.78-56.78×0.1×2.34
=56.78×(1.234-0.1×2.34)
=56.78×1
=56.78

Answer 3

1.234x56.78-5.678x2.34
=1.234x56.78-56.78x0.234
=56.78x（1.234-0.234）
=56.78x1
=56.78

Answer 4

=12.34*5.678-5.678*2.34
=5.678（12.34-2.34）
=5.678*10
=56.78

Answer 5

1.234×56.78－5.678×2.34
＝12.34×5.678－5.678×2.34
＝5.678×(12.34－2.34)
＝5.678×10
＝56.78