1.口算 25+13=38 47-12=35 36+20=56 58-8=50 19+30=49 72-40=32 44+5=49 61-31=30 33+22=55 85-50=35 28+40=68 96-6=90 51+17=68 64-23=41 16+70=86 77-45=32 42+35=77 88-71=17 29+50=79 53-10=43 2.在( )里填合适的数 24+(11)=35 (32)-12=20 41+(17)=58 45+(26)=71 63-(33)=30 (24)+18=42 75-(50)=25 (50)-14=36 30+(36)=66 (36)-25=11 52+( 8 )=60 39-(30)=9 89-(45)=44 (44)+33=77 48-(30)=18 (34)+21=55 17+(32)=49 (56)-40=16 60+(22)=82 91-(21)=70
