问题
解答题
解方程.
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答案
(1)x+
=5,7 12
x+
-7 12
=5-7 12
,7 12
x=4
;5 12
(2)x÷0.5=5.2,
x÷0.5×0.5=5.2×0.5,
x=2.6;
(3)x-0.2=5.6,
x-0.2+0.2=5.6+0.2,
x=5.8;
(4)33x=1.3+2,
33x=3.3,
33x÷33=3.3÷33,
x=0.1;
(5)15-x=2.4,
15-x+x=2.4+x,
15=2.4+x,
15-2.4=24+x-2.4,
x=12.6.
(6)x+
=1 4
,3 5
x+
-1 4
=1 4
-3 5
,1 4
x=
.7 20