Question

2.33的平方乘4减2.22的平方乘9=

Answer 1

2.33^2*4-2.22^2*9

=(2.33*2)^2-(2.22*3)^2

=(2.33*2+2.22*3)*(2.33*2-2.22*3)

=(4.66+6.66)(4.66-6.66)

=11.32*(-2)

=-22.64