1樓:手機使用者
(1)4x+3×0.7=6.5,
4x+2.1=6.5,
4x+2.1-2.1=6.5-2.1,
4x=4.4,
4x÷4=4.4÷4,
x=1.1;
(2)3.5x+1.5x=25,
(3.5+1.5)x=25,
5x=25,
5x÷5=25÷5,
x=5;
(3)x:版8=34:1
5,15
x=8×權34
,15x×5=6×5,
x=30.
解方程和比例. 14x+3×0.7=6.5 2x:8=34:
2樓:手機使用者
14x+3×0.7=6.5,
4x+2.1-2.1=6.5-2.1,
4x=4.4,
4x÷4=4.4÷4,
x=1.1;
2x:8=3
4:115,
115x=8×版34
,115x÷11
5=6÷115,
x=5;
32x+2×0.7=4.5,
2x+1.4-1.4=4.5-1.4,
2x=3.1,
2x÷2=3.1÷2,
x=1.55;
4權x:8=14:1
5,15
x=8×14,
15x÷15
=2÷15,
x=10.
3樓:在玉賴夏之
14x+3×0.7=6.5,
4x+2.1-2.1=6.5-2.1,
4x=4.4,
4x÷bai4=4.4÷4,
x=1.1;
du2x:zhi8=34:115,
115x=8×dao34,
115x÷115=6÷115,
x=5;
32x+2×0.7=4.5,
2x+1.4-1.4=4.5-1.4,
2x=3.1,
2x÷2=3.1÷2,
x=1.55;
4x:8=14:15,
15x=8×14,
15x÷15=2÷15,
x=10.
解比例或解方程
4樓:★柒柒
(1)3.25
8=6.5
x3.25x=8×6.5
3.25x÷3.25=52÷3.25
x=16;
(2)x:38=2
3:44x=38×2
34x÷4=14÷4
x=116
;(3)4x-0.36×5=0.6
4x-1.8+1.8=0.6+1.8
4x÷4=2.4÷4
x=0.6;
(4)2
3x+1
2x=4276
x=4276
x÷76
=42÷7
6x=36;
(5)4+0.8x=60
4+0.8x-4=60-4
0.8x÷0.8=56÷0.8
x=70;
(6)x×(1-15%)=25.5
85%x=25.5
85%x÷85%=25.5÷85%
x=30.
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