网址:http://m.1010jiajiao.com/timu3_id_584127[举报]
口算
(1)40×20= (2)5×10=
(3)13×6= (4)140×7=
80-70= 8+6= 13-8= 15-9= 16-8=
(1)40÷20= (2)72÷4=
(3)50÷10= (4)78÷6=