问题
解答题
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答案
(1)8x+2.7x=20.9
10.7x=20.9
10.7x÷10.7=20.9÷10.7
x=1
;102 107
(2)3x-2.3×2=2.6
3x-4.6+4.6=2.6+4.6
3x÷3=7.2÷3
x=2.4;
(3)7(x+4.2)=56
7(X+4.2)÷7=56÷7
x+4.2-4.2=8-4.2
x=3.8.
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(1)8x+2.7x=20.9
10.7x=20.9
10.7x÷10.7=20.9÷10.7
x=1
;102 107
(2)3x-2.3×2=2.6
3x-4.6+4.6=2.6+4.6
3x÷3=7.2÷3
x=2.4;
(3)7(x+4.2)=56
7(X+4.2)÷7=56÷7
x+4.2-4.2=8-4.2
x=3.8.