①46×58 ②39×62 ③62×53 ④75×38
3.5+7.8-6.3 (708-613)×23 58×(60÷4)
4.3+2.8= 540÷9= 16×50= 287÷9≈
6.7-5.9= 4800÷8 = 40×50= 48×51≈