求未知数x.(1)436÷x=10×25% (2)x-108÷1.5=70÷150% (3)0.4:45
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求未知数x. (1)436÷x=10×25% | (2)x-108÷1.5=70÷150% | |
(3)0.4:
(1)436÷x=10×25%,
436÷x=2.5, 436÷x×x=2.5×x, 2.5x=436, 2.5x÷2.5=436÷2.5, x=174.4; (2)x-108÷1.5=70÷150%, x-72=70÷ 3 2, x-72+72= 140 3+72, x= 356 3; (3)0.4: 4 5=x:60, 4 5x=0.4×60, 4 5x=24, 4 5x× 5 4=24× 5 4, x=30; (4) 4 5: 1 6=24:2x, 4 5×2x= 1 6×24, 8 5x=4, 8 5x× 5 8=4× 5 8, x= 5 2.
求未知数x.(1)436÷x=10×25% (2)x-108÷1.5=70÷150% (3)0.4:45
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