问题
解答题
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答案
(1)x:1.2=3:4,
4x=1.2×3,
4x=3.6,
4x÷4=3.6÷4,
x=0.9;
(2)x-
=8.5,3 20
x-
+3 20
=8.5+3 20
,3 20
x=8.65;
(3)
=0.5,3.2 x
×x=0.5×x,3.2 x
3.2=0.5x,
3.2÷0.5=0.5x÷0.5,
x=6.4.
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(1)x:1.2=3:4,
4x=1.2×3,
4x=3.6,
4x÷4=3.6÷4,
x=0.9;
(2)x-
=8.5,3 20
x-
+3 20
=8.5+3 20
,3 20
x=8.65;
(3)
=0.5,3.2 x
×x=0.5×x,3.2 x
3.2=0.5x,
3.2÷0.5=0.5x÷0.5,
x=6.4.