问题
解答题
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答案
(1)x+2.4=5.6,
x+2.4-2.4=5.6-2.4,
x=3.2;
(2)x-30=60,
x-30+30=60+30,
x=90;
(3)2.5x=8,
2.5x÷2.5=8÷2.5,
x=3.2;
(4)3x=54,
3x÷3=54÷3,
x=18;
(5)x÷0.3=4.2,
x÷0.3×0.3=4.2×0.3,
x=1.26.
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(1)x+2.4=5.6,
x+2.4-2.4=5.6-2.4,
x=3.2;
(2)x-30=60,
x-30+30=60+30,
x=90;
(3)2.5x=8,
2.5x÷2.5=8÷2.5,
x=3.2;
(4)3x=54,
3x÷3=54÷3,
x=18;
(5)x÷0.3=4.2,
x÷0.3×0.3=4.2×0.3,
x=1.26.