(1)2×(-5)+2 3 -3÷12;(2)1 1 2 ×[3× (- 2 3 ) 2 -1]- 1 3
(1)原式=-10+8-4 =-6;
(2)原式= ×[3× -1]- ×(-8) = ×[ -1]+ = × + = + = ;
(3)x- =2- 6x-3(x-1)=12-2(x+2) 6x-3x+3=12-2x-4 6x-3x+2x=12-4-3 5x=5 x=1;
(4) [x- (x-1)]= (2x+1) x- (x-1)=3x+ 6x-2x+2=18x+9 6x-2x-18x=9-2 -14x=7 x=- . |
计算(1)2×(-3)+22-3÷12(2)[(-1)2013-(34-16-38)×24]÷|-32+5
(1)2×(-3)+22-3÷
=-6+4-6
=-8;
(2)[(-1)2013-(--)×24]÷|-32+5|
=[(-1)-(18-4-9)]÷27
=[(-1)-5]÷27
=-6÷27
=-.
计算:(1)16+(-14)+(-16)-(-4);(2)(512+23?34)×(?12);(3)2×(?5)+22?3÷12;(4)?22+60
(1)原式=16-14-16+4
=16-16-14+4
=-10;
(2)原式=×(-12)+×(-12)-×(-12)
=-5-8+9
=-13+9
=-4;
(3)原式=-10+4-3×2
=-10+4-6
=-12;
(4)原式=-4+10×(-)
=-4-
=-;
(5)原式=0.25×(-8)-[4×+1]
=-2-[9+1]
=-2-10
=-12.
计算:(1)(-2)2×5-(-2)3÷4(2)-12-(3-5)+32×(1-3
(1)原式=4×5-(-8)÷4=20+2=22;
(2)原式=-1-(-2)+9×(-2)
=-1+2-18
=-19+2
=-17.
计算:(1)23×5-(-113)×5+(-1)×5;(2)-22-32×2+(-2)3÷(-12)
(1)原式=(+1-1)×5
=1×5
=5;
(2)原式=-4-3+(-8)×(-2)
=-4-3+16
=9.