递等式计算,能简便就简便.①、1又1/8+(5又1/2-0.35)×0.4 ②、1.5+(7又3/5-2.6)×1又1/2+(3-1又1/2)×94 ③、7.8÷【1.6×(1-3/8)+6.8】 ④、1.4+(3/8-0.25)÷1又1/4 ⑤、1.4×3又2/9-1又2/5×2又2/9 ⑥、(8/1
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![递等式计算,能简便就简便.①、1又1/8+(5又1/2-0.35)×0.4 ②、1.5+(7又3/5-2.6)×1又1/2+(3-1又1/2)×94 ③、7.8÷【1.6×(1-3/8)+6.8】 ④、1.4+(3/8-0.25)÷1又1/4 ⑤、1.4×3又2/9-1又2/5×2又2/9 ⑥、(8/1](/uploads/image/z/4318394-50-4.jpg?t=%E9%80%92%E7%AD%89%E5%BC%8F%E8%AE%A1%E7%AE%97%2C%E8%83%BD%E7%AE%80%E4%BE%BF%E5%B0%B1%E7%AE%80%E4%BE%BF.%E2%91%A0%E3%80%811%E5%8F%881%2F8%2B%EF%BC%885%E5%8F%881%2F2-0.35%EF%BC%89%C3%970.4+%E2%91%A1%E3%80%811.5%2B%EF%BC%887%E5%8F%883%2F5-2.6%EF%BC%89%C3%971%E5%8F%881%2F2%2B%EF%BC%883-1%E5%8F%881%2F2%EF%BC%89%C3%9794+%E2%91%A2%E3%80%817.8%C3%B7%E3%80%901.6%C3%97%EF%BC%881-3%2F8%EF%BC%89%2B6.8%E3%80%91+%E2%91%A3%E3%80%811.4%2B%EF%BC%883%2F8-0.25%EF%BC%89%C3%B71%E5%8F%881%2F4+%E2%91%A4%E3%80%811.4%C3%973%E5%8F%882%2F9-1%E5%8F%882%2F5%C3%972%E5%8F%882%2F9+%E2%91%A5%E3%80%81%EF%BC%888%2F1)
递等式计算,能简便就简便.①、1又1/8+(5又1/2-0.35)×0.4 ②、1.5+(7又3/5-2.6)×1又1/2+(3-1又1/2)×94 ③、7.8÷【1.6×(1-3/8)+6.8】 ④、1.4+(3/8-0.25)÷1又1/4 ⑤、1.4×3又2/9-1又2/5×2又2/9 ⑥、(8/1
递等式计算,能简便就简便.
①、1又1/8+(5又1/2-0.35)×0.4 ②、1.5+(7又3/5-2.6)×1又1/2+(3-1又1/2)×94 ③、7.8÷【1.6×(1-3/8)+6.8】 ④、1.4+(3/8-0.25)÷1又1/4 ⑤、1.4×3又2/9-1又2/5×2又2/9 ⑥、(8/15+0.45×2/3)÷2又1/12 ⑦、53.2÷【(6.5-2又1/4)÷8又1/2】
递等式计算,能简便就简便.①、1又1/8+(5又1/2-0.35)×0.4 ②、1.5+(7又3/5-2.6)×1又1/2+(3-1又1/2)×94 ③、7.8÷【1.6×(1-3/8)+6.8】 ④、1.4+(3/8-0.25)÷1又1/4 ⑤、1.4×3又2/9-1又2/5×2又2/9 ⑥、(8/1
①、1又1/8+(5又1/2-0.35)×0.4
解,得:
==(9/8)+(5.5-0.35)*0.4
==1.125+5.5*0.4-0.35*0.4
==1.125+2.2-0.14
==3.45-0.14
==3.31
②、1.5+(7又3/5-2.6)×1又1/2+(3-1又1/2)×94
解,得:
==1.5+(7.6-2.6)*1.5+(3-1.5)*94
==1.5*(1+5+1)*94
==1.5*7*94
==10.5*(100-6)
==1050-63
==987
③、7.8÷【1.6×(1-3/8)+6.8】
解,得:
==7.8÷【1.6×0.625+6.8】
==7.8÷【1+6.8】
==7.8÷7.8
==1
④、1.4+(3/8-0.25)÷1又1/4
解,得:
==1.4+(3/8-0.25)÷1.25
==1.4+0.125÷1.25
==1.4+0.1
==1.5
⑤、1.4×3又2/9-1又2/5×2又2/9
解,得:
==(7/5)*(29/9)-(7/5)*(20/9)
==(7/5)*[(29/9)-(20/9)]
==(7/5)*1
==7/5
⑥、(8/15+0.45×2/3)÷2又1/12
解,得:
==[(8/15)+(9/20)×(2/3)]÷(25/2)
==[(8/15)+(3/10)]*(2/25)
==(5/6)*(2/25)
==1/15
⑦、53.2÷【(6.5-2又1/4)÷8又1/2】
解,得:
==53.2÷【(6.5-2.25)÷8.5】
==53.2÷【4.25÷8.5】
==53.2÷0.5
==106.4