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简介:
(1)x÷0.8=2.5
x÷0.8×0.8=2.5×0.8
x=2
(2)9.53-x=6.28
9.53-x+x=6.28+x
6.28+x=9.53
6.28+x-6.28=9.53-6.28
x=3.25
(3)x+0.8=2.5
x+0.8-0.8=2.5-0.8
x=1.7
(4)25-5x=15
25-5x+5x=15+5x
25=15+5x
25-15=15+5x-15
10=5x
10+5=5x+5
x=2
(5)0.7×x=17.5
0.7×x÷0.7=17.5÷0.7
x=25
(6)3(x+0.5)=21
3(x+0.5)÷3=21÷3
x+0.5=7
x+0.5-0.5=7-0.5
x=6.5
(7)16+8x=40
16+8x-16=40-16
8x=24
8x÷8=24÷8
x=3
(8)4x-3×9=29
4x-27+27=29+27
4x=56
4x÷4=56÷4
x=14