求未知数x. 5 6 x-0.4=3.4 4(x+0.2)=2.4 5 8 :x=0.25:3 1.25 0.25 = x 6
x=4.56; (2)4(x+0.2)=2.4, 4(x+0.2)÷4=2.4÷4, x+0.2=0.6, x+0.2-0.2=0.6-0.2, x=0.4; (3)
x=7.5; (4)
0.25x=1.25×6, 0.25x=7.5, 0.25x÷0.25=7.5÷0.25, x=30. |
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