一到题简算:0.75*3.16+7.84*75%—75% 解方程:3x—120%x=0.45

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一到题简算:0.75*3.16+7.84*75%—75%解方程:3x—120%x=0.45一到题简算:0.75*3.16+7.84*75%—75%解方程:3x—120%x=0.45一到题简算:0.75

一到题简算:0.75*3.16+7.84*75%—75% 解方程:3x—120%x=0.45
一到题简算:0.75*3.16+7.84*75%—75% 解方程:3x—120%x=0.45

一到题简算:0.75*3.16+7.84*75%—75% 解方程:3x—120%x=0.45
0.75*3.16+7.84*75%—75%
=0.75*3.16+7.84*0.75-0.75
=0.75*(3.16+7.84-1)
=0.75*10
=7.5
3x—120%x=0.45
3x-1.2x=0.45
(3-1.2)x=0.45
1.8x=0.45
x=0.25