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4(X+0.8)=7,2怎么检验

4(x+0.8)=7.2 x+0.8=7.2÷4 x+0.8=1.8 x=1 或者: 4(x+0.8)=7.2 4x+3.2=7.2 4x=7.2-3.2 4x=4 x=1

(1)4(x+0.8)=7.2, 4x+3.2=7.2, 4x+3.2-3.2=7.2-3.2, 4x=4, 4x÷4=4÷4, x=1;(2)(x-1.8)÷4=2.5 (x-1.8)÷4×4=2.5×4, x-1.8=10, x-1.8+1.8=10+1.8, x=11.8;(2)5(x-6.5)=1.7, 5(x-6.5)÷5=1.7÷5, x-6.5=0.34, x-6.5+6.5=0...

x+0.8=1.8 x=1 检验:把x=1代入方程左边,得 4×(1+0.8)=4×1.8=7.2=方程右边

4(X+0.8)=7.2 解:4(X+0.8)÷4=7.2÷4 X+0.8=1.8 X+0.8-0.8=1.8-0.8 X=1

4x+3.2=7 4x=3.8 x=0.95

由题,原题=3.2+4x=7.2 4x=4 x=1

4*0.8=2.7+x x=4*0.8-2.7 x=3.2-2.7 x=0.5 谢谢,请采纳

先6乘以7.2等于43.2再减去0.8最后等于42.4

(x+0.8)÷6=7.2 解:(x+0.8)÷6×6=7.2×6 x+0.8=43.2 x+0.8-0.8=43.2-0.8 x=42.6

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