0.25变成分式就是1/4
7.6÷4+2.4×0.25=7.6*1/4+2.4*1/4=(7.6+2.4)*1/4=10*1/4=5/2
7.6÷4+2.4×0.25
=7.6×1/4+2.4×1/4
(除法转化为乘法)
=(7.6+2.4)×1/4
(
乘法分配律
的逆运算)
=10×1/4
=2又2分之一或2.5
7.6÷4+2.4×0.25
=7.6×0.25+2.4×0.25
=(7.6+2.4)×0.25
=10×0.25
=2.5
请选为最佳答案,谢谢
7.6~=8
8/4=2
2.4~=2.5
2.5*0.25=0.625
7.6÷4+2.4×0.25~=2+0.625=2.625