问题
解答题
(1)3x-5.2-2.2x=6.8
(2)9.5(x-3)=76
(3)60x-7.5=35x
(4)x÷3-27=18.
答案
(1)3x-5.2-2.2x=6.8
0.8x-5.2+5.2=6.8+5.2
0.8x=12
0.8x÷0.8=12÷0.8
x=15;
(2)9.5(x-3)=76
9.5(x-3)÷9.5=76÷9.5
x-3=8
x-3+3=8+3
x=11;
(3)60x-7.5=35x
60x-7.5-35x=35x-35x
25x-7.5+7.5=0+7.5
25x=7.5
25x÷25=7.5÷25
x=0.3;
(4)x÷3-27=18
x÷3-27+27=18+27
x÷3=45
x÷3×3=45×3
x=135.