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二点5×4.8的简便运算3种答案一样

4.8-1.2×4 =4.8-4.8 =0 你好,本题已解答,如果满意 请点右下角“采纳答案”。

2.1乘12.5乘4.8,该怎么简便运算的

12.5x4.8 =12.5x8x0.6 =100x0.6 =60

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2.5×4.8 =2.5*4*1.2 =12 2.5×4.8 =4.8*2+4.8*0.5 =9.6+2.4 =12 满意采纳奥

4.8×0.7+5.2 =4.8×0.7+5.2×0.7+5.2×0.3 =(4.8+5.2)×0.7+1.56 =10×0.7+1.56 =7+1.56 =8.56

5.2×1.9+0.52×45+4.8×6.4的简便运算 =5.2×(1.9+4.5)+4.8×6.4 =5.2×6.4+4.8×6.4 =6.4×(5.2+4.8) =6.4×10 =64

4.8×7.8+78×0.52 =4.8×7.8+7.8×10×0.52 =4.8×7.8+7.8×5.2 =(4.8+5.2)×7.8 =10×7.8 =78

4.8×7.05–5.43 =(5-0.2)×7.05–5.43 =5×7.05-0.2×7.05–5.43 =35.25-1.41–5.43 =35.25-6.84 =35.25-7+0.16 =28.25+0.16 =28.41

后面的分数 分子和分母都乘以10 变为(48+0.32)/16 得 3+0.02 再加前面的2.48等于5.5

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