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3.14x1.2x1.2x2=

解: 这个用计算器非常好算: 3.14x1.2x1.2x2 =(3.14x2)x(1.2x1.2) =6.28x1.44 =9.0432

6.28x……

=3.14*(2+0.1) =3.14*2+0.314 =6.28+0.314 =6,594

2×3.14×1/4x×x+3.14×1/4x²=310 3.14x²×(1/2+1/4)=310 x²=310÷3.14÷(3/4) x²≈131.6 x≈±11.47

3.14x(4÷2)的平方x1.2x3分之一 =3.14x4x0.4 =3.14x1.6 =5.024

3.14*(1.2^2-1^2)=3.14*[(1.2+1)(1.2-1)]=3.14*(2.2*0.2)=3.14*0.44 应该是考查平方差公式的运用

1/4×3.14x400x2-400 =628-400 =228

rr

=三分之一*2.1*3.14*25 =0.7*78.5 =54.95

3.14x2.6+ 1·86x2·6 =2.6×(3.14+1.86) =2.6×5 =13

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