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- 2026-04-27如果3a+7=9.那么7a -=( ).
- 2026-04-27解方程. (1)5x+0.75×4=6.5 (2)0.8:=x:0.75
- 2026-04-27解比例. (1)x:24=5:3 (2):=2:x (3)4.8:3.6=x: (4)=
- 2026-04-27解方程. (1)7-1.5x=6 (2)x:0.4 =:0.3
- 2026-04-27若3x+2y = 4.2x+3y = 46.则x=.y=.
- 2026-04-27求未知数x. (1)x - x=8 (2)x:28%=:0.7
- 2026-04-27求未知数x. (1)5.1x - 1.7×3=30.6 (2):x=:
- 2026-04-27求未知数x的值. (1)3x+2.4x= * 验算: (2)0.8x-28.7=11.3 * 验算: (3)(x-5)=75% = 4 (5)36:72=14:x (6)5.6:x=3.6:1.8 (