[7/10-(1/2+2/5×50%)]÷16/7
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前面大括号里面=O
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直接写出得数.1- 2 5 = 4× 3 16 = 3 7 ×5÷ 3 7 ×5= 10÷ 5 7 = 1.23+7.7
计算下面各题. 3 5 + 2 5 ÷ 1 5 5 7 ×(7- 2 5 ) ( 2 5 + 2 7 × 7 10 )÷
口算 2 7 - 2 7 ÷3= 1 4 ×8÷ 1 4 ×8= 4.5×101= 31.7-10.8= 2÷ 1 5
1+1×2+2×3+3×4+4÷5+5÷6+6÷7+7÷8+8÷9+9÷10+10=?
①36×2/7×5/72×43②(7/8+7/16)÷7/16③6/7×3/4+1/4×6/7
2 1 6 - ÷ ( )= - × ( )= - × ( )=20÷( ) =1 7 10 5
10-10.5÷[5.2×14.6-(9.2×5.2+5.4×3.7-4.6×1.5)]+(1.7+1.9)÷0.225
(5/18-(7/12-2/5))×15/14 15/16+(7/16-1/4)÷1/2 4/
-16×(-7/8+3/4-1/2)÷(-5)
直接写出得数. [3/4]×16=12÷[3/5]=24×[5/6]=[5/7]×[2/3]÷[5/7]=1÷[7/8]