下面各题,怎样简便就怎样算.(0.86+0.86+0.86+0.86)×25 0.2+(3.4+)×7.6×÷[1.9﹣1.9×(1.9﹣1.9)] 74×19+19×25.4.
6×98+36×0.2 9.57﹣(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] .
神机妙算:(怎样简便就怎样算)4+16÷ ÷×64﹣1 ×[﹣(﹣)]×0.53+75%×1.47 25×3.2×1.25 ÷.