1、22.54+（-4.4+（-12.54 ）+4.4（2/3-1/2)-(1/3-5/6)2.4-(-3/5)+(3.1)+4/5(-6/13)+(-7/13)-（-2）3/4-（-11/6)+(-7/3)2、计算：(1)4.2+5 .7 8.4+10； (2)6.13.74.9+1 .8；(3) +1； (4) + + ；3165213、计算：(1)216157+348+512 678； (2)81.26293.8+8.74+111；(3)4 +1 17 2 ； (4)2.25+3 12 8 ；32141874312534、计算：(1)12(18)+(7)15；(2)4028 (19)+(24
2、)(32) ；(3)4.7(8.9)7.5+(6)；(4) +( )( ) ；32614212.计算：(1)4 ; (2)5 10.8;3172(3)0.120.54 ; (4) 4.72+16.425.282.(1)3 (2)5.3 (3)0.57 (4)6.42解：(1)4.2+5.78.4+10=5.7+104.28.4=15 .712.6=3.1(2)6.13.7 4.9+1.8=6.1+1.83.74.9=7 .98.6=0.7(4) + + = + = =6521134(3) +1= +1 = =3323、解：(1) 216157+348+512 678=348+512216157
3、678=860 1051=191(2)81.6293 .8+8.74+111=81.26+8.74+111293.8=201293.8=92.8(3)4 +1 17 2 =4 17 2 +1 =24 +1 =2232118731871361287(4)2.25+3 12 8 =2.25+3 12 8 =620 =14553494、解：(1)12 (18)+(7)15=12+18715=3022=8(2)4028 (19)+(24)(32)=4028+1924+32=40 28 24+19+32=92+51=41(3)4.7(8.9)7.5+(6)=4.7+8.97.56=13.613.5=0.1(4) +( )( ) = + = +326142134236124= + =1422.54+（-4.4+（-12.54 ）+4.4=10（2/3-1/2)-(1/3-5/6)=2/32.4-(-3/5)+(3.1)+4/5=6.9(-6/13)+(-7/13)-（-2）=13/4-（-11/6)+(-7/3)=1/4
