乘法分配律为:两个数的和与一个数相乘,先将它们与这个数分别相乘,再相加,积不变.即:(a+b)×c=a×c+b×c.反过来则:a×c+b×c=(a+b)×c127×43-27×43= 43× ( 127-27)= 43×100= 4300
127x43-27x43=(127-27)x43=100x43=4300
127x43-27x43=43x(127-27)=43x100=4300
=(127-27)×43=100×43=4300