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1.4%5x=0.8怎么检验

0.2×1.4+5x=12 0.28+5x=12 5x=11.72 x=2.344

1.4-5x=0.8 5x=1.4-0.8 5x=0.6 x=0.6÷5 x=0.12

5X(1.4-0.4)=5

(12.5x0.54x1.4)(0.21x25x0.8) =(12.5x2x0.7x0.54)(0.21x25x4x0.2)=(25x0.7x0.54)(0.21x20)=17.5x0.54x4.2=35x2.1x0.54=73.5x0.54=39.69。

5x-3x=1.4 2x=1.4 x=1.4÷2 x=0.7

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