脱式计算,能简算的要简算.+×+÷4 12.4﹣2.4×3.75÷2.52.5×﹣0.21÷+9.63 1999+999×999.
脱式计算,能简算的要简算.1.69÷1.3+2.5×0.4 375+450÷18×25 2×1.4+2×1.6 83×102﹣83×2.
选择最适合的方法,写出递等式计算的过程39.6﹣6.53+3.47. 0.0125×32×0.25. [90﹣(8.25÷0.6+1.25)]×0.01.38×2.5+76+38×5.5. 3.6×31.4+43.9×6.4. 5.7×5.7+5.7×4.2+5.7×0.1.
计算,能简算的要简算7.26+3.2÷2.5 14.6﹣4.6×2.8 0.8+0.8+…+0.8+15×0.2 15个0.814.5×102 4.05÷0.5﹣1.14 9.99×99+9.99.
递等式计算,能简算的用简便方法算:8.46﹣8.46÷4+4.985 43.56÷12.5 6.4×3.28+4.6×3.28﹣3.28 99.9×10.1.
下面各题怎样简便就怎样计算(1)12.64﹣(3.96+4.64)(2)36.26﹣4.78+3.74(3)7.34+7.57+12.66+6.43 (4)78.65﹣23.12﹣14.88.