简算:8X56+18Ⅹ44=8X56+(8+10)X44=8X56+8X44+10X44=8X(56+44)+440=8Ⅹ100+440=800+440=1240
8×56+18×44简便算法?如果题目是:18*56+18*44=18*(56+44)=18*100=1800
8×56+18×44=8×56+(8+10)×44=8×56+8×44+10×44=8×(56+44)+440=8×100+440=800+440=1240