数学简算题

314x0.043+3.14x7.2-31.4x0.15
=3.14x4.3+3.14x7.2-3.14x1.5
=3.14x(4.3+7.2-1.5)
=3.14x10
=31.4
9.99x2.22+3.33x3.34
=3.33x6.66+3.33x3.34
=3.33x(6.66+3.34)
=3.33x10
=33.3
99.99x0.8+11.11x2.8
=11.11x7.2+11.11x2.8
=11.11x（7.2+2.8）
=11.11x10
=111.1

1.314x0.043+3.14x7.2-31.4x0.15=3.14x4.3+3.14x7.2-3.14x1.5=3.14x(4.3+7.2-1.5)=3.14x10=31.4
2.
9.99x2.22+3.33x3.34=3.33x3x2.22+3.33x3.34=3.33x(3x2.22+3.34)=3.33x(6.66+3.34)=3.33x10=33.3

...314x(0.043+0.072-0.015)=314x0.1=31.4

3.14*（4.3+7.2-0.15）第二题3.33*(3*2.22+3.34)