几道小学简算题,求高手帮助,谢谢!!!!
①498+9870÷35②420.5-294÷2.8×2.1③(2/3-2/5)÷(1/8+5/12)④2/3÷(3/4+1/12×4/5)...
①498+9870÷35
②420.5-294÷2.8×2.1
③(2/3-2/5)÷(1/8+5/12)
④2/3÷(3/4+1/12×4/5) 展开
②420.5-294÷2.8×2.1
③(2/3-2/5)÷(1/8+5/12)
④2/3÷(3/4+1/12×4/5) 展开
展开全部
①498+9870÷35
=498+9870÷7÷5
=498+1410÷5
=498+282
=780
②420.5-294÷2.8×2.1
=420.5-294÷4×(2.1÷0.7)
=420.5-73.5×3
=420.5-220.5
=200
③(2/3-2/5)÷(1/8+5/12)
=4/15÷13/24
=32/65
④2/3÷(3/4+1/12×4/5)
=2/3÷(3/4+1/15)
=2/3÷49/60
=40/49
=498+9870÷7÷5
=498+1410÷5
=498+282
=780
②420.5-294÷2.8×2.1
=420.5-294÷4×(2.1÷0.7)
=420.5-73.5×3
=420.5-220.5
=200
③(2/3-2/5)÷(1/8+5/12)
=4/15÷13/24
=32/65
④2/3÷(3/4+1/12×4/5)
=2/3÷(3/4+1/15)
=2/3÷49/60
=40/49
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