大师作文网0.3:7=3 14:
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/12 16:58:29
1、(0.3+0.3)/0.3-0.3/0.3=12、(0.3+0.3)/0.3*0.3/0.3=23、(0.3+0.3+0.3+0.3)/0.3=44、(0.2+0.2)/0.2+0.2/0.2=3
外项积等于内项积.把它写成分数形式,对角线乘积相等.
2x+7/0.3-2x-3/0.7=0.310（2x+7）/3-10（2x-3）/7=0.370（2x+7）-30（2x-3）=6.3140x+490-60x+90=6.380x=-573.7x=-7
0.3x-x×0.25=21.15-7x0.3x-0.25x=21.15-7x0.5x=21.15-7x0.5x+7x=21.157.5x=21.15x=21.15÷7.5x=2.82这里涉及到“两边
(0.3+7-0.25)x=21.157.05x=21.15x=21.15/7.05=3
0.3x-x乘以0.25=21.15-7x0.05x+7x=21.157.05x=21.15x=3
2.1+4x=12.54x=12.5-2.14x=10.4x=10.4÷4x=2.6
交叉相乘,内项之积等于外项之积,12*0.3=7x7x=3.6x=18/35（35分之18,分数符号不太好打）
1.8x-0.3x=71.5x=73/2x=7x=14/3
5X+0.3=7X-0.17X-5X=0.3+0.12X=0.4X=0.4/2X=0.2
0.3x+7x-15%x=21.250.3x+7x-0.15x=21.257.15x=21.25715x=2125143x=425x=425/143
5X+0.3=7X-1.30.3+1.3=7X-5X2.6=2XX=1.3
0.3×7+4x=12.52.1+4x=12.54x=12.5-2.14x=10.4x=2.6
7/8x+0.3=14.3两边同时乘以8得7x+2.4=114.47x=114.4-2.47x=112x=112÷7x=16
0.3x+7x-0.25x=21.257.05x=21.25705x=2125x=425/141
X—7*0.3=6.4x-2.1=6.4x=6.4+2.1x=8.5
X+0.3=7X-0.16x=0.4x=1/15
0.3x+7x-0.25x=7.05x7.05x=21.15x=3