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(﹣2x)3=﹣2x3 ﹣a2•a=﹣a3 (﹣x)9+(﹣x)9=﹣2x9 (﹣2a3)2=4a6
3﹣=2 x2•x3=x6 ﹣2+|﹣2|=0 (﹣3)﹣2=
﹣2﹣(﹣2)=0 ﹣3﹣4=﹣7 ﹣7﹣(﹣3)=﹣10 12﹣15=﹣3
(﹣2x)3=﹣2x3 ﹣a2•a=﹣a3 (﹣x)9+(﹣x)9=﹣2x9 (﹣2a3)2=4a6
2m+3n=5mn a6÷a2=a4 (x2)3=x6 a•a2=a3
2a+3a=5a x2・x= -x3 2x-3x= -1 (-x3)2= x6
3﹣=2 x2•x3=x6 ﹣2+|﹣2|=0 (﹣3)﹣2=
(一2x)3=一2x3 一a2·a=一a3 (一x)9 ÷(一x)3=x6 (-2a 3)2=4a6
x3m+1=(x3)m+1 x3m+1=x•x3m x3m+1=xm•x2m•x x3m+1=(xm)3•x
a2·a=a3 (ab)2=a2b2 (a2)3=a5 -a+2a=a
-7+4=-3 0-(-6)=6 -5-(-4)=-1 2-3=1
5a3﹣a3=4a3 (a2b)3=a6b3 (a﹣b)3(b﹣a)2=(a﹣b)5 2m•3n=6m+n
(-2)0=1 28x4y2÷7x3=4xy2 (4xy2-6x2y+2xy)÷2xy=2y-3x (a-5)(a+3)=a2-2a-15
(x+1)(x+4)=x2+5x+4 (y+4)(y-5)=y2+9y-20 (m+2)(m-3)=m2-m-6 (x-3)(x-6)=x2-9x+18
(-2)0=1 28x4y2÷7x3=4xy2 (4xy2-6x2y+2xy)÷2xy=2y-3x (a-5)(a+3)=a2-2a-15
1.9°=6840″ 90′=1.5° 32.15°=32°15′ 2700″=45′
0.25°=900″ 1.5°=90′ 1 000″=()° 125.45°=1 254.5′