www.5129.net > ?18÷(?3)2+5×(?12)3?(?15)÷5

?18÷(?3)2+5×(?12)3?(?15)÷5

?18÷(?3)2+5×(?12)3?(?15)÷5=-18÷9+5×(-18)+3=-2-58+3=38.

13/15-[(1/2)÷5/12-2/3] =13/15-[(1/2)×12/5-2/3] =13/15-(6/5-2/3) =13/15-(18/15-10/15) =13/15-8/15 =5/15 =1/3

①原式=1-(-23-14)×12=1+23×12+14×12=1+8+3=12;②原式=-18-9+5×(-18)+2×5×5=-27-58+50=2238.

(1)原式=12+18-7-15=8(2)原式=27+40=67(3)原式=-4×(-12)+8÷4=4(4)原式=1-2+5-5=-1(5)原式=100÷4-3-8=14(6)原式=-18-58=-34(7)原式=a2+4ab-ab+a2-2ab=2a2+ab.

(1)原式=(74-78-712)×(-87)=-2+1+23=-13;(2)原式=(1035-835)+(-356-216)=2+(-6)=-4;(3)原式=-18×19+5×(-18)+3=-2-58+3=38.

(1)-23+(+58)-(-5),=-23+58+5,=-23+63,=40;(2)40÷(-8)+(-3)×(-2)2+18,=-5-12+18,=1;(3)(12+56?712)×(?36),=-18-30+21,=-27;(4)?22×(?12)+8÷(?2)2,=-4×(?12)+8÷4,=2+2,=4.

(1)-20-(-15)+(-12)-(+5)=-20+15-12-5=-37+25=-12;(2)-14-(-2)2÷(-2)-(-3)3×(?23)2=-1-4÷(-2)-(-27)×49=-1+2+12=13.

(1)原式=12-7.5+18-32.5=-10; (2)原式=154×(-49)=-53;(3)原式=(-8)×3+16.5=-7.5; (4)原式=(13-1121+314)×(-42)=13×(-42)-1121×(-42)+314×(-42)=(-14)+22-9=-1;(5)原式=(-3)×[169+2]-9÷(-2)=(-3)×18-9÷(-2...

(1)原式=-78+5+0.5+15-0.5=-58;(2)原式=7+(-9)=-2;(3)原式=-34×(-9×49-4)=-34×(-8)=6;(4)原式=(-34-59+712)×36=-34×36-59×36+712×36=-27-20+21=-26.

(1)3×(-4)+(-28)÷7=-12-4=-16;(2)4×(-3)2-15÷(-3)-50=4×9+5-50=36+5-50=-9;(3)(?14+16?18+112)×(?24)=6-4+3-2=9-6=3;(4)?13?(1?0.5)×13×[2?(?3)2]=-1-12×13×[2-9]=-1-12×13×(-7)=-1+76=16;(5)9989×(?13)=(100-19)×(-...

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