直接写出得数3.1+5.6= 1.2+0.3= 102×3= 2.65+0.73=240÷16= 25×8= 2.12﹣0.9= 1+0.2=0.54﹣0.45= 3.25+1= 1.4﹣0.5= 1﹣0.25=
6×98+36×0.29.57﹣(2.57+3.38)﹣2.62.
计算: (1) (2) (3) (4) (5).
计算,能简算的要简算. (4﹣7.5×)÷0.25÷+0.25×2.8×+1.2÷ 45÷[72×()]7.2+[(7.8+)÷0.4].
下面各题,怎样简便就怎样算. (0.86+0.86+0.86+0.86)×250.2+(3.4+)× 7.6×÷[1.9﹣1.9×(1.9﹣1.9)]74×19+19×25.4.
神机妙算:(怎样简便就怎样算) 4+16÷÷×64﹣1×[﹣(﹣)]×0.53+75%×1.4725×3.2×1.25÷.