用简便方法计算下面各题. 1.8×5.46+1.8×4.54 0.65×
用简便方法计算下面各题.1.8×5.46+1.8×4.540.65×2012.33×0.5×499×5.64.8×0.252.64+8.67+1.33-1.64....
用简便方法计算下面各题. 1.8×5.46+1.8×4.54 0.65×201 2.33×0.5×4 99×5.6 4.8×0.25 2.64+8.67+1.33-1.64.
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(1)1.8×5.46+1.8×4.54, =1.8×(5.46+4.54), =1.8×10, =18; (2)0.65×201, =0.65×(200+1), =0.65×200+0.65, =130+0.65,没谨 =130.65; (3)2.33×0.5×4, =2.33×(0.5×4), =2.33×2, =4.66; (4)99×5.6,悉镇 =(100-1)×5.6, =100×5.6-5.6, =560-5.6, =554.4; (睁察粗5)4.8×0.25, =1.2×(4×0.25), =1.2×1, =1.2; (6)2.64+8.67+1.33-1.64, =(2.64-1.64)+(8.67+1.33), =1+10, =11. |
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