解方程(前两个题按解方程过程填空,后两个题自己解方程).
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解方程(前两个题按解方程过程填空,后两个题自己解方程).
①x-12.3=3.8解:
x-12.3+______=3.8+______
x=______
②1.2x=48
解:1.2x÷______=48÷______
x=______
③4.5x-1.5x=13.5
④5x+3.9=5.1.
①x-12.3=3.8解:
x-12.3+______=3.8+______
x=______
②1.2x=48
解:1.2x÷______=48÷______
x=______
③4.5x-1.5x=13.5
④5x+3.9=5.1.
①x-12.3=3.8,
x-12.3+12.3=3.8+12.3,
x=16.1;
②1.2x=48,
1.2x÷1.2=48÷1.2,
x=40;
③4.5x-1.5x=13.5,
(4.5-1.5)x=13.5,
3x=13.5,
3x÷3=13.5÷3,
x=4.5;
④5x+3.9=5.1,
5x+3.9-3.9=5.1-3.9,
5x=1.2,
5x÷5=1.2÷5,
x=0.24.
故答案为:12.3,12.3,16.1;1.2,1.2,40.
x-12.3+12.3=3.8+12.3,
x=16.1;
②1.2x=48,
1.2x÷1.2=48÷1.2,
x=40;
③4.5x-1.5x=13.5,
(4.5-1.5)x=13.5,
3x=13.5,
3x÷3=13.5÷3,
x=4.5;
④5x+3.9=5.1,
5x+3.9-3.9=5.1-3.9,
5x=1.2,
5x÷5=1.2÷5,
x=0.24.
故答案为:12.3,12.3,16.1;1.2,1.2,40.