解方程和比例. ①4x+3×0.7=6.5 ②x:8=34:
解方程和比例.①4x+3×0.7=6.5②x:8=34:115③2x+2×0.7=4.5④x:8=14:15....
解方程和比例. ①4x+3×0.7=6.5 ②x:8=34:115 ③2x+2×0.7=4.5 ④x:8=14:15.
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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=34:115,
115x=8×34,
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.
4x+2.1-2.1=6.5-2.1,
4x=4.4,
4x÷4=4.4÷4,
x=1.1;
②x:8=34:115,
115x=8×34,
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.
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