Question

简便运算10.25x39+102.5x4.1+20x20.5

简便运算10.25x39+102.5x4.1+20x20.5

Answer 1

10.25x39+102.5x4.1+20x20.5
=10.25x39+10.25x41+40x10.25
=10.25x(39+41+40)
=10.25x120
=10.25x100 +10.25x20
=1025 + 205
=1230

Answer 2

25X102=25×100+25×2=2550。24X26+6X96,=24×26+6×4×24=24×(26+24)=1200。125÷5X8÷20,=(125×8)÷(5×20)=10。（8X58+8X32-80）×125=8×(58+32—10)×125=80000。