问题
解答题
解方程.
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答案
(1)x+0.3=1.8,
x+0.3-0.3=1.8-0.3,
x=1.5;
(2)x-1.5=4,
x-1.5+1.5=4+1.5,
x=5.5;
(3)5x=1.5,
5x÷5=1.5÷5,
x=0.3;
(4)x÷5=15,
x÷5×5=15×5,
x=75.
解方程.
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(1)x+0.3=1.8,
x+0.3-0.3=1.8-0.3,
x=1.5;
(2)x-1.5=4,
x-1.5+1.5=4+1.5,
x=5.5;
(3)5x=1.5,
5x÷5=1.5÷5,
x=0.3;
(4)x÷5=15,
x÷5×5=15×5,
x=75.