25.5*0.65* 4 /0.65 和 4.4+4.4*12+13*5.6 那俩题 [ 要简便计算的 ]

25.5*0.65* 4 /0.65
=25.5*4
=(25+0.5)*4
=25*4+0.5*4
=100+2
=102
4.4+4.4*12+13*5.6
=4.4*1+4.4*12+13*5.6
=4.4*(1+12)+13*5.6
=4.4*13+13*5.6
=13*(4.4+5.6)
=13*10
=130
对不对?
对了给我最佳!