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3.88×4.2×5.8÷(1.9×1.4×2.9)简便运算

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。

①625×80-2520÷24,=50000-105,=49895;②(6+10.88÷3.2)×1.5,=(6+3.4)×1.5,=9.4×1.5,=14.1;③ 1 9 × 10 13 + 8 13 ÷ 9,= 1 9 × 10 13 + 8 13 × 1 9 ,=( 10 13 + 8 13 )× 1 9 ,= 18 13 × 1 9 ,= 2 13 ;④[( 6 5 - 1 2 )÷14]× 4 3 ...

1.2÷0.02=600.6+1.3=1.93.08×0.45=1.3869.88÷1.9=5.2验算:3.92÷3.7≈1.06

①12.5×8.88=12.5×(1.11×8)=(12.5×8)×1.11=100×1.11=111②1.9+19.9+199.9+0.3=1.9+19.9+199.9+0.1+0.1+0.1=(1.9+0.1)+(19.9+0.1)+(199.9+0.1)=2+20+200=222③10.01×101-10.01=10.01×(101-1)=10.01×100=1001

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