(-30)÷(1/3-1/5-1/15)=(-30)÷(5/15-3/15-1/15)=-30÷1/15=-30x15=-450
(-30)÷(1/3-1/5-1/15)=?
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(-1/15 )÷(-1/30 )-3/10 +(-1/30 )-(-6/5 )÷1/30
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30÷(1+1/3)x-15÷x=5
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15+30÷X=30÷1.5X
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能简便简便.① 1/7 × 3/5 + 1/7 ÷ 5/2 ②(2/3+1/5)× 15/4 ③ 17/30÷(3/5+
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填空题哦,1.12/20=3÷5=()/30=15÷()=()2.21÷42=()÷()=()/()=()/()
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口算我最棒!1+40%= 1-34%= 20%+51%= 3%×30%= 30÷15%= 75÷5%= 160%-20%
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①[4/7÷5②38÷14]③[1/3÷15]④[2/3÷1
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(1/2+1/3+1/4)÷1/30+(1/3+1/5+1/7)÷1/105+(1/5+1/7+1/9)÷1/315
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(-1/30)/(1/3-1/5-1/15)