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求大神帮忙!! 20
1个回答
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(1) 7x-2x=63
(7-2)x=63
5x=63
x=63÷5
x=12.6
(2)3(x-2)=9.6
x-2=9.6÷3
x-2=3.2
x=3.2+2
x=5.2
(3)7x÷3=8.19
7x=8.19×3
7x=24.57
x=24.57÷7
x=3.51
(4) 3×7+4x=33
21+4x=33
4x=33-21
4x=12
x=3
(7-2)x=63
5x=63
x=63÷5
x=12.6
(2)3(x-2)=9.6
x-2=9.6÷3
x-2=3.2
x=3.2+2
x=5.2
(3)7x÷3=8.19
7x=8.19×3
7x=24.57
x=24.57÷7
x=3.51
(4) 3×7+4x=33
21+4x=33
4x=33-21
4x=12
x=3
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