判断对错并改正
用你喜欢的方法计算.(1)2.67+5.04+1.96(2)0.802+5.33+0.198﹣2.33(3)7.49﹣(0.56+2.49)(4)21.43﹣2.17﹣7.83+8.57.
简便运算(1)(25+32)×4 (2)725+308+275+682 (3)125×9×16(4)83×102 (5)25×(13×24)(6)76×176﹣76×76﹣76.
58×52+58×50﹣58×2.
用简便方法计算.201×42 47×48+48×53137×46﹣37×46 125×32×25.
脱式计算6.47×4.5+3.53×4.5 0.25×8×40×0.125.