1+12.7+5.9+17.3 270﹣42.5﹣17.5 125×88 130÷25÷425×32×125 125×103﹣125×3 22.4×25﹣25×2.4.
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÷.