解方程24x-8x=28.8 4.5x+1.6x=42.7 (7-1.4)x=2.8 9x-5.2×6=4.8  ...
解方程24x-8x=28.84.5x+1.6x=42.7(7-1.4)x=2.89x-5.2×6=4.8(2.5+x)÷0.8=50.5×(x-1.8)=2.48.9-5...
解方程24x-8x=28.8 4.5x+1.6x=42.7 (7-1.4)x=2.8 9x-5.2×6=4.8 (2.5+x)÷0.8=5 0.5×(x-1.8)=2.4 8.9-5x=2.7 3.54×5-1.7x=13.45 1.6x+2x×0.7=18.
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(1)24x-8x=28.8
16x=28.8
16x÷16=28.8÷16
x=1.8;
(2)4.5x+1.6x=42.7
6.1x=42.7
6.1x÷6.1=42.7÷6.1
x=7;
(3)(7-1.4)x=2.8
5.6x=2.8
5.6x÷5.6=2.8÷5.6
x=0.5;
(4)9x-5.2×6=4.8
9x-31.2=4.8
9x-31.2+31.2=4.8+31.2
9x=36
9x÷9=36÷9
x=4;
(5)(2.5+x)÷0.8=5
(2.5+x)÷0.8×0.8=5×0.8
2.5+x=4
2.5+x-2.5=4-2.5
x=1.5;
(6)0.5×(x-1.8)=2.4
0.5×(x-1.8)÷0.5=2.4÷0.5
x-1.8=4.8
x-1.8+1.8=4.8+1.8
x=6.6;
(7)8.9-5x=2.7
8.9-5x+5x=2.7+5x
8.9=2.7+5x
8.9-2.7=2.7+5x-2.7
5x=6.2
5x÷5=6.2÷5
x=1.24;
(8)3.54×5-1.7x=13.45
17.7-1.7x=13.45
17.7-1.7x+1.7x=13.45+1.7x
17.7=13.45+1.7x
17.7-13.45=13.45+1.7x-13.45
4.25=1.7x
4.25÷1.7=1.7x÷1.7
x=2.5;
(9)1.6x+2x×0.7=18
1.6x+1.4x=18
3x=18
3x÷3=18÷3
x=6.
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