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2.5x0.6十1.9x0.5怎么简算

2.5x3.8x0.4x0.2 =(2.5x0.4)x(3.8x0.2) =1x0.76 =0.76 6.5xl.9一6.5x0.9 =6.5x(1.9-0.9) =6.5x1 =6.5 2.7X10.2 =2.7x10+2.7x0.2 =27+0.54 =27.54 9.8X25 =10x25-0.2x25 =250-5 =245 供参考。

7.5x2.3+1.9x2.5+12.5x0.4 =2.5x3x2.3+1.9x2.5+2.5x5x0.4 =2.5x(6.9+1.9+2) =2.5x10.8 =2.5x(10+0.8) =2.5x10+2.5x0.8 =25+2 =27

0.5:1.5=x:12 1:3=2x:24 6x=24 x=4 x:9=4:3 3x=36 x=12 x:1.6=5:4 4x=1.6×5=8 x=8÷4=2 x:3=6:9 9x=3×6=18 x=18÷9=2 1:5=2.5:x x=2.5×5=12.5

3.46X9.9十0346二3.46X(9.9十0.1)=34.6

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