解方程: 0.4x-7=21 x÷32=18 4.5x+5.4=14.4 8x+5x-7=19 x-1.4=18.43 3×1.5+6x=33.
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①0.4x-7=21
0.4x-7+7=21+7
0.4x=28
0.4x÷0.4=28÷0.4
x=70
②x÷32=18
x÷32×32=18×32
x=576
③4.5x+5.4=14.4
4.5x+5.4-5.4=14.4-5.4
4.5x=9
4.5x÷4.5=9÷4.5
x=2
④8x+5x-7=19
13x-7=19
13x-7+7=19+7
13x=26
13x÷13=26÷13
x=2
⑤x-1.4=18.43
x-1.4+1.4=18.43+1.4
x=19.73
⑥3×1.5+6x=33
4.5+6x=33
4.5+6x-4.5=33-4.5
6x=28.5
6x÷6=28.5÷6
x=4.75
0.4x-7+7=21+7
0.4x=28
0.4x÷0.4=28÷0.4
x=70
②x÷32=18
x÷32×32=18×32
x=576
③4.5x+5.4=14.4
4.5x+5.4-5.4=14.4-5.4
4.5x=9
4.5x÷4.5=9÷4.5
x=2
④8x+5x-7=19
13x-7=19
13x-7+7=19+7
13x=26
13x÷13=26÷13
x=2
⑤x-1.4=18.43
x-1.4+1.4=18.43+1.4
x=19.73
⑥3×1.5+6x=33
4.5+6x=33
4.5+6x-4.5=33-4.5
6x=28.5
6x÷6=28.5÷6
x=4.75
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