解方程并验算(1)3x-0.5x=2.8 验算:(2)5.64x+3.2x=21 验算:(3)0.27×3-6x=51% 验算:(4)7x=3/25+2x 验算:
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![解方程并验算(1)3x-0.5x=2.8 验算:(2)5.64x+3.2x=21 验算:(3)0.27×3-6x=51% 验算:(4)7x=3/25+2x 验算:](/uploads/image/z/572021-53-1.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%E5%B9%B6%E9%AA%8C%E7%AE%97%EF%BC%881%EF%BC%893x-0.5x%3D2.8+%E9%AA%8C%E7%AE%97%EF%BC%9A%EF%BC%882%EF%BC%895.64x%2B3.2x%3D21+%E9%AA%8C%E7%AE%97%EF%BC%9A%EF%BC%883%EF%BC%890.27%C3%973-6x%3D51%25+%E9%AA%8C%E7%AE%97%EF%BC%9A%EF%BC%884%EF%BC%897x%3D3%2F25%2B2x+%E9%AA%8C%E7%AE%97%EF%BC%9A)
解方程并验算(1)3x-0.5x=2.8 验算:(2)5.64x+3.2x=21 验算:(3)0.27×3-6x=51% 验算:(4)7x=3/25+2x 验算:
解方程并验算
(1)3x-0.5x=2.8 验算:
(2)5.64x+3.2x=21 验算:
(3)0.27×3-6x=51% 验算:
(4)7x=3/25+2x 验算:
解方程并验算(1)3x-0.5x=2.8 验算:(2)5.64x+3.2x=21 验算:(3)0.27×3-6x=51% 验算:(4)7x=3/25+2x 验算:
(1):2.5X=208
X=?
把“X=?”代入“3X-0.5X”,求出它的值,再用那个值跟“2.8”相比,若相等,则“X=?”是正确的
(2)(3)(4)均是如此
(1)3x-0.5x=2.8
2.5x=2.8
x=28/25
验算:3*28/25 -0.5*28/25=2.8
(2)5.64x+3.2x=21
8.84x=21
x=221/525
验算:5.64*221/525+3.2*221/525=21
(3)0.27×3-6x=51%
6x=0.3
x=0.05<...
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(1)3x-0.5x=2.8
2.5x=2.8
x=28/25
验算:3*28/25 -0.5*28/25=2.8
(2)5.64x+3.2x=21
8.84x=21
x=221/525
验算:5.64*221/525+3.2*221/525=21
(3)0.27×3-6x=51%
6x=0.3
x=0.05
验算: 0.27*3-6*0.05=0.51=51%
(4)7x=3/25+2x
5x=3/25
x=3/125
验算:7*(3/125)=21/125
3/25+2*(3/125)=21/125
7*(3/125)=3/25+2*(3/125)
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