求未知数X. 5X-2.7= X:3.6= : 5X-0.8×10=3.19.
舜璟南歆
2019-12-21
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(1)5X-2.7=
,
5X-2.7+2.7=0.8+2.7,
5X=3.5,
5X÷5=3.5÷5,
X=0.7;
(2)X:3.6=
:
,
X=3.6×
,
0.8X=2.7,
0.8X÷0.8=2.7÷0.8,
X=3.375;
(3)5X-0.8×10=3.19,
5X-8=3.19,
5X-8+8=3.19+8,
5X=11.19,
5X÷5=11.19÷5,
X=2.238.
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