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8-1.2×1.5+742÷(2.544÷2.4)怎么算

8-1.2x1.5+742÷(2.544÷4) =8-1.8+742÷0.636 =6.2+1166.66667 =1172.86667

解:(1)2.15+8.73+1.27+7.85=(2.15+7.85)+(8.73+1.27),=10+10,=20;(2)11.87-(8.2+1.87),=11.87-1.87-8.2,=10-8.2,=1.8;(3)5.42-3.87-1.13,=5.42-5,=0.42; (4)4.38-1.56+0.62-0.44,=(4.38+0.62)-(1.56+0.44),=5-2...

如图

31.8×7'9+2.5×二又1/10-44.3×2.1要简算 31.8×7'9+2.5×二又1/10-44.3×2.1 =31.8*7.9+2.5*2.1-44.3*2.1 =31.8*7.9-2.1*(44.3-2.5) =31.8*(7.9-2.1) =31.8*5.8 =184.44

(1)0.36+6.4=6.76,12×2.5=30,4.4÷0.44=10,0÷0.54=0;(2)8-4.5=3.5,0.08×0.1=0.008,9.6÷0.3=32,0.5×1.8=0.9.故答案为:6.76,30,10,0,3.5,0.008,32,0.9.

32ⅹ25x125怎样简便运算 =4x8x25x25 =(4x25)x(8x125) =100x1000 =100000

45 × 2/3 + 1/3 × 15 27.7/19 + 12/19 × 5/6 28.1/4 + 3/4 ÷ 2/3 29.8/7 × 21/16 + 1/2 30.101 × 1/5 – 1/...

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