125×[80+8] 36×68+68×64 37×101-37 47×98 108×8 92+9×92 = = = = = = = = = = = = = = = =用乘法分配律算....

问题描述:

125×[80+8] 36×68+68×64 37×101-37 47×98 108×8 92+9×92 = = = = = = = = = = = = = = = =
用乘法分配律算....

125×[80+8]=125×80+125×8=10000+1000=1100036×68+68×64=68x(36+64)=68x100=680037×101-37= 37×(100+1)-37=37x100+37x1-37=3700+37-37=370047×98= 47×(100-2)=47x100-2x47=4700-94=4606108×8=(100+8)x8=...