(-123)×(-4)+125×(-5)-127×(-4)-5×75=一定得正确啊 拜托了

(-123)×(-4)+125×(-5)-127×(-4)-5×75
=(-123)×(-4)-127×(-4)+125×(-5)-5×75
=(-4)×(-123-127)+(-5)×(125+75)
=(-4)×(-250)+(-5)×200
=1000-1000
=0

(-123)×(-4)+125×(-5)-127×(-4)-5×75=\
=123*4+125*(-5)+127*4-5*25*3
=(123+127)*4+125*(-5)-125*3
=250*4-125*(5+3)
=0