歐陽數創編歐陽數創編歐陽數創編四年級小數乘除法計算題時間：2021.03.02創作：歐陽數185.44-1641.84-721.7-967.5-105230.4-0.6121.24-360.736-2343.5x1235.21-739.6x246.21-0.03210-1.451.3-0.2791.2x3.80.756-0.180.66-0.311.97x1.569.6-2.938.4-0.815-0.0615.6x2.93.77x1.80.02x965.22x0.39.99x0.024.67-0.95x2.441.666-6.19.432x0.0025.6x6.54.88-2.90.61x4.38.9-2.45.5x559.77x0.021.384-5.18.78x8312.6x610.059x0.24.268x1.75.7x5.79.46x2.8517.8x6.41.5-4.912.5x0.885.555x5.22.22x3.337.658x8536.02-0.356.78x8（循環小數的用簡便方法，除不盡保留2位小數）：8.2-0.120.8-0.976.4-5.44.7-31.25-1.232-4214.36-2.78.33-6.21.7-0.032.41-0.7用豎式計算0.396-1.2= 0.756-0.36=15.6x1.3=0.18x1.5=0.025x1.4= 13.06x36=0.04x0.12二3.84x2.6-歐陽數創編歐陽數創編歐陽數創編歐陽數創編5.76x3= 17.15x22 90.75-3.33.68x0.2516.9-0.13 1.55-3.93.7-0.01613.76-0.8=5.2x0.6 18.4-1.36.4x0.54.48x0.415.25x535.4x4.2 0.042x0.540.76-0.320.25x0.046 2.52x3.4 1.08-250.12x0.5x0.16二4.8x0.25= 0.125x1,4”（保留兩位小數）2.5-0.7= （保留三位小數） 10.1-3.3=（商用循環小數）10.75-12.5=（用乘法驗算） 3.25x9.04=（用除法驗算）3、脫式計算（能簡算的要簡算）2.5x7.1x4 16.12x99+16.12 5.2x0.9+0.97.28x99+7.28 4.3x50x0.2 64-2.64x0.526x15.7+15.7x24 （2.275+0.625）x0.283.94+34.3x0.2

2.7x5.4x3.91.2x(9.6-2.4)-4.88.9x1.1x4.72.7x5.4x3.93.6x9.85-5.468.05x3.4+7.66.58x4.5x0.92.8x0.5+1.588.05x3.4+7.66.58x4.5x0.92.8x0.5+1.5832+4.9-0.94.8-4.8x0.5(1.25-32+4.9-0.94.8-4.8x0.5(1.25-0.125)x84.8x100.156.5x99+56.57.09x10.8-4.8x100.156.5x99+56.57.09x10.8-0.8x7.094.85+0.35彳4.85+0.35彳1.48.7x17.4-8.77.412.5x0.4x2.5x80.87x3.16+4.64 9.5x101 0.68-(5.2-3.5)x1.2540.5彳0.81x0.18 4.8x(15彳2.4)6.81+6.81x99 0.25x185x40 4.4x0.8-3.4x0.8(9.37+9.37+9.37+9.37)x2.52.37x6.3+2.37x3.72.5x1.25x0.32 3.8x10.12.5x(3.8x0.04)7.69x1013.8x10.10.25x39+0.25 0.125x7246x0.33+54x0.33(8x5.27)x1.25 6.81+6.81x99 0.25x185x40

6.8x0.75-0.53.75-0