Question

递等式计算，能简算的要简算2.6+1.4×3； 0.25×1...

递等式计算，能简算的要简算2.6+1.4×3； 0.25×13.7×4； 1.6×（2.25+10.5÷1.5）；0.65×6.4-0.65×5.4； 19.5÷0.4÷0.25．

Answer 1

①2.6+1.4×3
=2.6+4.2
=6.8
           
②0.25×13.7×4
=0.25×4×13.7
=1×13.7
=13.7
      
③1.6×（2.25+10.5÷1.5）
=1.6×（2.25+7）
=1.6×（9+0.25）
=1.6×9+4×0.25×0.4
=14.4+0.4
=14.8

④0.65×6.4-0.65×5.4 
=0.65×（6.4-5.4）
=0.65×1
=0.65             

⑤19.5÷0.4÷0.25
=19.5÷（0.4×0.25）
=19.5÷0.1
=195