Several multiplication problems in grade one of junior high school ①、-2X(-2)X π X((-6)X7X(- π ) ② 3x (- 2) x 3x (- 4) x (- 7) x one sixth There's also a formula...

Several multiplication problems in grade one of junior high school ①、-2X(-2)X π X((-6)X7X(- π ) ② 3x (- 2) x 3x (- 4) x (- 7) x one sixth There's also a formula...

The original formula is 4 Π×< [- 6] × 7 × [- Π] >
=4∏×<-42×〔-∏〕>
=4∏×42∏
168 Π square
The original formula = - 6 × 3 × [- 4] × < - 7 >× 1 / 6
= - 18 × < - 4 >× < - 7 / 6 >
= 72 × < - 7 / 6 >
=-84