苏教版数学四年级下册第六单元21+3434+21108+3737+108=55=55=145=14517+2828+71281728+1728+71281728+1728+71281728+1728+71281728+17恭喜你答对了恭喜你答对了28+17+2317+282328+(17+23)17+28+2317+282328+(17+23)17+28+2317+282328+(17+23)17+28+23恭喜你答对了恭喜你答对了17+282328+(17+23)17+28+23恭喜你答对了恭喜你答对了恭喜你答对了恭喜你答对了75+(47+25)75+(47+25)75+472547+75+2547+(75+25)75+(47+25)75+472547+75+2547+(75+25)75+(47+25)75+472547+75+2547+(75+25)恭喜你答对了恭喜你答对了75+(47+25)75+472547+75+2547+(75+25)恭喜你答对了恭喜你答对了恭喜你答对了恭喜你答对了