解决问题解决问题练习课练习课13+44-27-5 4+2 7-4 1+65-0 7-3 2+56-3 6-45-3 7 225373 6472223?个个4 + 3 = 74 + 3 = 7( (个个) )47 77 4 = 37 4 = 3个个( (个个) )?个个5? ?个个7 77 3 = 47 3 = 4个个( (个个) )6?个?个?个?个73=473=4(个)(个)7 73+4=73+4=7(个)(个)7大括号,小问号,大括号,小问号,求总数,用加法。求总数,用加法。小问号,在两边,小问号,在两边,求部分,用减法。求部分,用减法。8?个9?条?条10?只?只7 只只11?只128只只?只?只138本本?只?只14- = - = 6 2 46 4 215 + = + = - = - = 16?只只7只只 = = 17 18