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8X9=72X多少+8X2动脑

(1)6*0.5+8X=39 解:3+8x=39 8x=39-3 8x=36 x=4.5 (2) 9*8-4X=60 解:72-4x=60 4x=72-60 4x=12 x=3 (3) 7X-X=124.8 解:7x-1x=124.8 (7-1)x=124.8 6x=124.8 x=20.8

[7/8+4/9] ÷ 1/72 = [7/8+4/9] * 72 = 7/8* 72 +4/9* 72 = 63+32 = 95 1/8÷1/5-5/8x10/11 = 1/8 * 5 - 5/8x10/11= 5/8 - 1/44 =(55-2)/88 = 53/88 7/15÷14÷2/3 = 7/15 * 1/14* 3/2 = 1/5 * 1/2 *1/2 = 1/20 3/4÷12 * 16/21+3/14 = 3/4 *1/12 * ...

(2-6)x(3-9)=(-4)x(-6)=24;(6-2)x(9-3)=4x6=24;(2+6)x9÷3=8x9÷3=72÷3=24;2x(6+9-3)=2x12=12;2x6+3+9=12+3+9=24;(3-2...

解:设5角1支的铅笔买了x支,则8角1支的铅笔买了(9-x)支.由题意,得0.5x+0.8(9-x)=6解得x=4,则9-x=5答:5角1支的铅笔买了4支,8角...

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