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2x-5.2=2.82x+2.8×2=10.442x+25x=1342.5x=14.
题目详情
2x-5.2=2.8 | |||
2x+2.8×2=10.4 | |||
42x+25x=134 | |||
2.5x=14. |
▼优质解答
答案和解析
(1)2x-5.2=2.8,
2x-5.2+5.2=2.8+5.2,
2x÷2=8÷2,
x=4;
(2)2x+2.8×2=10.4,
2x+5.6-5.6=10.4-5.6,
2x÷2=4.8÷2,
x=2.4;
(3)42x+25x=134,
67x=134,
67x÷67=134÷67,
x=2;
(4)2.5x=14,
2.5x÷2.5=14÷2.5,
x=5.6.
2x-5.2+5.2=2.8+5.2,
2x÷2=8÷2,
x=4;
(2)2x+2.8×2=10.4,
2x+5.6-5.6=10.4-5.6,
2x÷2=4.8÷2,
x=2.4;
(3)42x+25x=134,
67x=134,
67x÷67=134÷67,
x=2;
(4)2.5x=14,
2.5x÷2.5=14÷2.5,
x=5.6.
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