简 便 计 算 4.6+5.4 ()2.8+7.2+ +2.25+ + + 0.75+0.375 +(+) 5- 4.25+60.5+62.5% (+)22+2575%-7 +3.125+ +(-1.8) (111+999) 56(-)-(50-)0.6 + 45(+0.6)89737.5%+1040.375 ( 7199 3755+2996 8439+1001446+295 888+999 1125-996299101 563999 21002060.25 72156-5672 25321257092263.7+54+8.25+12.5%1161 1553.43 4.6+3+64+2.25+5+748.37-3.25-(1.37+1.75)
