七年级数学上册第二章有理数2.8有理数的加减混合运算作业(新版)华东师大版.doc

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12.8 有理数的加减混合运算1计算:(1)(+16)+(29)(+11)+(+9)(2)(3.1)(4.5) + (+4.4) (+10.3) + (2.5)(3)(+ 21)5+( 3)(+ 41)+( 32)(4)(2.6)(4.7)(+0.5)+(-2.4)-(3.2)2计算:(1)(6)(+6)(7) (2)0(+8)+(27)(+5)(3) ( 3)+(+0.25)+( 61)(+ 2) (4) (+3 53)+(+4 4)(+1 52)+(3 4)(5)10(8)+(3)(5) (6)1(69)(113)(7) )8()9(5)7(8)1(-0. +2. -5. 4(9)3()262参考答案:1.(1)-15 (2)-7 (3)-5 (4)-7342. (1)-5(2)-40(3) (4)3 (5)16(6)141312 15(7)解:原式= )8(2)9()7( = 895=(3+5+9)+( 7 2 8)=17+( 17)=0(8)解:原式=(0.5)+(+0.25)+(+2.75)+(5.5)=0.5+0.25+2.755.5=(0.55.5)+(0.25+2.75)=6+3=3(9)解: 45)6(1234)54()(623150)6(421

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