Question

8.4×3.6＋0.64×84简便计算

Answer 1

8.4×3.6+0.64×84
=8.4×3.6+6.4×8.4
=8.4×(3.6+6.4)
=8.4×10
=84

Answer 2

8.4×3.6+0.64×84=8.4×3.6+6.4×8.4=8.4×（3.6+6.4）=84

追问

7.5×99＋2×7.5

简便计算

追答

7.5×99+2×7.5=7.5×（100-1）+2×7.5=750-7.5+2×7.5=750-7.5=742.5

追问

8.3×10.2-8.3×0.2

简便

追答

8.3×10.2-8.3×0.2=8.3×（10.2-0.2）=83

Answer 3

8.4×3.6＋0.64×84=8.4x(3.6+6.4)=8.4x10=84

Answer 4

8.4×3.6十0.64x84=84x3.6十8.4x6.4=8.4x（3.6+6.4）=8.4x10=84

Answer 5

8.4 * 3.6 = 84 * 0.36；
84 * ( 0.36 + 0.64) = 84。