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12.6×7.6×2.32÷1.9÷1.4÷2.9用简便方法怎样运算

原式 =(12.6÷1.4)x(7.6÷1.9)x(2.32÷2.9) =9x4x0.8 =36x0.8 =28.8 供参考。

原式=(12.6÷1.4)×(7.6÷1.9)×(2.32÷2.9) =9×4×0.8 =36×0.8 =28.8 望采纳,谢谢

=12.6/1.4*(7.6/1.9)*(2.32/2.9) =9*4*0.8 =36*0.8 =144/5=28.8

接下

(1)2.8×7.6+1.4×2.8+2.8 =2.8×(7.6+1.4+1)=2.8×10=28(2)4.5×1.2-3.15÷15=5.4-0.21=5.19(3)[12.8-(7.5+4.5)]×2.5=[12.8-12]×2.5=0.8×2.5=2(4)0.65+2.7+0.35+7.3 =(0.65+0.35)+(2.7+7.3)=1+10=11(5)3.8×0.56+0.56×6.2=(3.8+6.2...

1.44

=4.06+28.8 =32.86

18.9-18.9÷1.4+18.9 = 18.9-27÷2+18.9 = 18.9-13.5+18.9 = 5.4+18.9 = 24.3

原式应该是 3.8x4.2x5.8÷1.9÷1.4÷2.9 =(3.8÷1.9)x(4.2÷1.4)x(5.8÷2.9) =2x3x2 =6x2 =12 供参考。

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