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0.45X12x0.2,0.87x5.2+4.64脱式计算

0.45X12x0.2 =(0.45x0.2)x12 =0.09x12 =1.08 0.87x5.2+4.64 =0.87x5+0.87x0.2+4.64 =4.35+0.174+4.64 =4.524+4.64 =9.164

0.45x1.2x2 =0.45x2x1.2 =0.9x1.2 =9/10x12/10 =108/100 =1.08

4.7x5.9+5.2x4.7-4.7x1.1 =4.7×(5.9+5.2-1.1) =4.7×10 =47

35.2+64.8÷0.5x1.2脱式计算 解: 35.2+64.8÷0.5x1.2 =35.2+129.6x1.2 =35.2+155.52 =190.72

7.2×1.8+5.9 =12.96+5.9 =18.86 你好,本题已解答,如果满意 请点右下角“采纳答案”。

(3.64一5.696/8.9x1.2)x0.05 =(3.64-0.64x1.2)x0.05 =(3.64-0.768)x0.05 =2.872x0.05 =0.1436 (请采纳)

解:采用分配律, 原式=5.16+3.8x1.2-6.9 =5.16+3.8x(1+0.2)-6.9 =5.16+3.8+3.8x0.2-6.9 =8.96-6.9+0.76 =2.06+0.76 =3.82

9.75一4.25x1.2 =9.75-5.1 =4.65

原式= 1.25x(752+44.5+3.5) =1.25x800 =1000

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