题型一:等号左边“x”,直接消等号左边的数, x−57=712 解:x−57+57=712+57 x=4984+6084 x=10984 29+x=76 解:29+x−29=76−29 x=2118−418 x=1718 x+(35−27)=57 解:x+(2135−1035)=57 x+1135=57 x+1135−1135=57−1135 x=2535−1135 x=1435 x=25 x−(13+14)=712 解:x−(412+312)=712 x−712=712 x−712+712=712+712 x=1412 x=76 题型二:等号左边“-x”,先把等号左边“-x”消掉
