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7.2x0.15怎么算

7.38x0.5x20-2.15这道题怎么简算 =0.5x20x7.38-2.15 =10x7.38-2.15 =73.8-2.15 =71.65

原式 =7.38x0.5x20-2.15 =7.38x(0.5x20)-2.15 =7.38x10-2.15 =73.8-2.15 =70.65

7.2-0.15x=6.9 7.2-6.9=0.15x 0.15x = 0.3 x = 2

2(x➕1)➕7=15 解 2x➕2➕7=15 2x=15➖7➖2 2x=6 x=3

7/15x=2-0.6 7/15x=1.4 x=1.4x15/7 x=3

15%x=3 15x=300 x=300/15=20 34%x+7=24 34%x=24-7=17 2%x=1 x=5 180%x÷0.5=7.2÷0.5 180%x=7.2 1.8x=7.2 x=4 10.7+20%x=18.7 10.7+0.2x=18.7 0.2x=18.7-10.7=8 x=8/0.2=40 x-85%x=1.2 x-0.85=1.2 0.15x=1.2 x=1.2/0.15=8 2.5x=3÷0.3 2.5x=10 x=10...

0.7x+0.3x=9 解: x=9 2x-2×0.3=8 解: 2x-0.6=8 2x=8-0.6 2x=7.4 x=3.7 2x+15×2=48 解: 2x+30=48 2x=48-30 2x=18 x=9 6.6x-5x=6.4 解: 1.6x=6.4 x=4

3.14x43+7.2x31.4-150x0.314 =3.14x43+72x3.14-15x3.14 =3.14x(43+72-15) =3.14x100 =314

1、350 2、84 3、600 4、2|5:1|4=1.6 5、3/4:10=7.5

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