有7x+2x=140 9.3x+5.7x=4.5 6x+3x=180 7x-5x=16 7.8x-2.4x=1.08 5.8x+9.2x=72 25x+35x=460 跪谢

问题描述:

有7x+2x=140 9.3x+5.7x=4.5 6x+3x=180 7x-5x=16 7.8x-2.4x=1.08 5.8x+9.2x=72 25x+35x=460 跪谢

140/9 0.3 20 8 0.2 4.8 23/3过程1 7x+2x = 9x = 1402 (9.3+5.7)x=15x=4.53 (6+3)x=9x=1804(7-5)x=2x=165 (7.8-2.4)x=5.4x=1.086(5.8+9.2)x=15x=727 (25+35)x=60x=460 这样算过程吧???