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[1.8%(1÷75%+1/3)]×1又5/8脱式计算.(能简算的要简算)

[1.8-(1÷75%+1/3)]×1又5/8 =【1.8-4/3+1/3)]×13/8 =【9/5-(4/3-1/3)]×13/8 =[9/5-1]×13/8 =4/5×13/8 =13/10

(1)56×( 3 7 - 3 8 ),=56× 3 7 -56× 3 8 ,=24-21,=3;(2)9.75-3.42-5.58,=9.75-(3.42+5.58),=9.75-9,=0.75;(3)2.1×0.5÷4.2,=2.1÷4.2×0.5,=0.5×0.5,=0.25; (4) 3 8 × 6 7 + 6 7 ÷8,=( 3 8 + 1 8 )× 6 7 ,= 1 2 × 6 7...

我擦,这么多,我。。。。先去散散步

(1)496-23×16=500-23×2×8-4,=500-368-4,=128;(2)(49+23)×12+719=109×12+719,=403+719,=134057;(3)(25+12)÷75%=910÷34,=65;(4)(2.5-2.5×0.6)÷0.4=[(1-0.6)×2.5]÷0.4,=[0.4×2.5]÷0.4,=0.4÷0.4×2.5,=1×2.5,=2.5.

77=1+2(n-1)=39 (1+77)×39÷2=1521

(1)7.5×2.3+1.9×2.5=17.25+4.75=22;(2)(78.6-0.786×25十75%×21.4)×2011÷75,=(78.6-78.6×0.25+75%×21.4)×2011÷75,=[(1-0.25)×78.6+0.75×21.4]×2011÷75,=[0.75×78.6+0.75×21.4]×2011÷75,=(78.6+21.4)×0.75×2011÷75,=100×0.75×20...

(3/2+75%)÷(2—2/1) =(1.5+0.75)÷(2-0.5) =2.25÷1.5 =1.5 您好,答题不易 如有帮助请采纳,谢谢

(1)7.5×2.3+1.9×2.5=17.25+4.75=22;(2)(78.6-0.786×25十75%×21.4)×2011÷75,=(78.6-78.6×0.25+75%×21.4)×2011÷75,=[(1-0.25)×78.6+0.75×21.4]×2011÷75,=[0.75×78.6+0.75×21.4]×2011÷75,=(78.6+21.4)×0.75×2011÷75,=100×0.75×2...

如图

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