问题
解答题
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答案
(1)370+x=480,
370-370+x=480-370,
x=110;
(2)0.7x=0.91,
0.7x÷0.7=0.91÷0.7,
x=1.3;
(3)x-8.3=16.4,
x-8.3+8.3=16.4+8.3,
x=24.7;
(4)x÷12=180,
x÷12×12=180×12,
x=2160;
(5)x+
=2 7
,5 7
x+
-2 7
=2 7
-5 7
,2 7
x=
;3 7
(6)8.6-x=2.8,
8.6-x+x=2.8+x,
2.8+x=8.6,
2.8-2.8+x=8.6-2.8,
x=5.8.