![小学四年级数学上册脱式题](/zb_users/upload/2023/10/2962b22e6f1111ee9f9f5254000ebf90.jpeg)
① 102Ⅹ45
=(100+2)Ⅹ45
=100Ⅹ45+2×45
=4500+90
=4590
②4500÷25
=(4500X2)÷(25Ⅹ2)
=9000÷50
=180
③325一12一188
=325一(12十188)
=325一200
=125
① 102Ⅹ45
=(100+2)Ⅹ45
=100Ⅹ45+2×45
=4500+90
=4590
②4500÷25
=(4500X2)÷(25Ⅹ2)
=9000÷50
=180
③325一12一188
=325一(12十188)
=325一200
=125