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32x12.5x2.4简便计算

960

32x12.5x2.5 =8x12.5x4x2.5 =100x10 =1000

19.2\2.4x3.2 =19.2÷8÷0.3×3.2 =2.4÷0.3×3.2 =8×3.2 =25.6 12.5x0.32x0.5 =12.5×0.8×0.4×0.5 =10×0.2 =2 14.3\1.1-1.8 =13-1.8 =11.2 3.2x2.4+32x0.76 =3.2×2.4+3.2×7.6 =3.2×(2.4+7.6) =3.2×10 =32

(2)7.2X(36.3-16.3) (3)100X0.57+2X0.57

12.5x32x0.025 =12.5x32x0.1/4 =12.5x0.1x(32/4) =1.25x8 =10

1、(x^2+5x+2)(x^2+5x+3)-12 =(X²+5X+2)²+(X²+5X+2)-12 =(X²+5X+2+4)(X²+5X+2-3) =(X+2)(X+3)(X²+5X-1) 2.、x^2-32x+231 =(X-11)(X-21) 3、(x^2+x+1)(x^2+x+2)-12 =(X²+X)²+3(X²+X)-10 =(X&#...

=12.5*(8*4)*25=(12.5*8)*(4*25)=100*100=10000

把原不等式组简化为5x?2>3x+312x?1≤7?32x,由①得x>52,由②得x≤4,解得52<x≤4,这个不等式组的解集为52<x≤4.(2)这个不等式组的整数解是3,4.

(1)原式=8xy-3x2-5x-6xy+4x2=2xy-5x+x2,把x=-1,y=12代入,原式=2?(-1)?12+5+1=-1+5+1=5;(2)原式=12x-2x+23y2-32x+13y2=-3x+y2,把x=-2,y=23代入,原式=-3×(-2)+(23)2=649.

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