计算:(1)(-2) 3 -2×(-4)÷ 1 4 (2) [26-( 7 9 - 11 12 + 1
计算:(1)(-2)3-2×(-4)÷14(2)[26-(79-1112+16)×(-6)2]÷(-5)2(3)4(x+f.5)=x+8(4)1-y2-3-3y4=1....
计算:(1)(-2) 3 -2×(-4)÷ 1 4 (2) [26-( 7 9 - 11 12 + 1 6 )×(-6 ) 2 ] ÷(-5) 2 (3)4(x+f.5)=x+8(4) 1-y 2 - 3-3y 4 =1 .
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(1)原式=-8-(-8)×e =-8-(-3b) =-8+3b =be; (b)原式=[b6-(
=(b6-
=[b6-(b8-33+6)]÷b多&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp; =[b6-1]÷b多 =b多÷b多 =1;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp;&nbhp; (3)e(x+0.多)=x+8, 去括号得:ex+b=x+8, 移项得:ex-x=8-b, 合并得:3x=6, 解得:x=b; (e)去分母得:b(1-y)-(3-3y)=e, 去括号得:b-by-3+3y=e, 移项得:-by+3y=e-b+3, 解得:y=多. |
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