“17.5除0.25乘17加13”的简便算法该如何求,急

17.5/0.25*17+13
=17.5*4*17+13
=(17+0.5)*4*17+13
=17*4*17+0.5*4*17+13
=68*17+2*17+13
=(68+2)*17+13
=70*17+13
=1190+13
=1203

17.5÷0.25×17+13=(17.5)×4×17+13=1190+13=1203

17.5÷0.25乘17加13
=17.5×4÷（0.25×4）×17+13
=70×17+13
=1190+13
=1203