3.解方程 (1) 0.4x-3*0.7=1.9
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答案10,x=10,解方程,0.4x-3x0.7=1.9,0.4x-2.1=1.9,0.4x-2.1+2.1=1.9+2.1,0.4x=4,0.4x➗0.4=4➗0.4,x=10
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3.解方程 (1) 0.4x-3*0.7=1.9
答案10,x=10,解方程,0.4x-3x0.7=1.9,0.4x-2.1=1.9,0.4x-2.1+2.1=1.9+2.1,0.4x=4,0.4x➗0.4=4➗0.4,x=10
答案10,x=10,解方程,0.4x-3x0.7=1.9,0.4x-2.1=1.9,0.4x-2.1+2.1=1.9+2.1,0.4x=4,0.4x➗0.4=4➗0.4,x=10