650克=________千克 90厘米=________米
456千克=________吨 8米90厘米=________米
2千克600克=________千克 7元4角8分=________元
=21.32-6.32-8.3
=15-8.3
=6.7
=21.32-6.32+8.3
=23.3
=12.45-(1.35+0.65)
=12.45-2
=10.45