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2.1 3.1 0.4的简便运算

2.1/3.5/0.4的简便运算2.1÷3.5÷0.4 =2.1÷(3.5x0.4)=2.1÷1.4=1.5 希望能帮到你

0.15+(3.74-1.8)/0.4 =(0.06+3.74-1.8)/0.4 =(3.8-1.8)*5/2 =2*5/2 =5

能2.1÷3.5÷0.4=0.3*7÷7÷(0.5*0.4)=0.3÷0.2=1.5

2.1除以2.5再除以0.4脱式简便运算2.1÷2.5÷0.4 =2.1÷(2.5x0.4)=2.1÷1=2.1

23一12x05十21=2.3-0.6+2.1=1.7+2.1=3.8

0.3*2.5*0.4=0.3*(2.5*0.4)=0.3*1=0.3

=2.1*0.4-0.15*0.4=0.84-0.06=0.78

2.1÷3.5÷0.4=0.6÷0.4=1.5

2.1÷0.25*4=2.1*4÷0.25=2.1*4*4=8.4*4=33.6

解:3.1÷[1-(0.4 1/4)]=3.1÷[(4-0.41)/4]=3.1÷3.59/4=12.4÷3.59=0.34540

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