计算下面各题:
(1– × )÷ ÷ ×7
–( + ) × –
25÷( – ) + –
( – )÷( + ) [ + +
×[ ÷( + )] 12÷(1– )
[(1– × )÷ [(1– )× ]÷4
用简便方法计算:
( – )×70 97×
×8+ ×2 15× +15×
( + – )×72 72×( – + )
( + )×9+ 30×( – + )
12×( – + ) + × +
4– ÷ – 48×( – + )
÷9+ × 24×( + )
( + )×60–27 5– –
用简便方法计算:
×(9+ )– ÷ + ×
+ ÷ + 2– × –
30×( + – ) + ÷ +
10÷10 +24 ÷12 × +5.2× +1÷
直接写出得数。
2.4÷0.125= 555×13-111×15= 25×0.32×0.25=
125-25+75= 999×15= 10-3.25+9÷0.3= 43.2÷0.125=
55×( - )= ×2005= 10 -(4 +3 )-0.75=
解方程:
+X = 2X– =
3X–1.4×2=1.1 X+ – =
5.5x–3x = 1.75 X+ =
解方程:
X = 15× X×( + )=
X×(1+ )= 25 (1– )X =
X× × = 10 X× = 8×
X× = 15÷X =
解方程:
X× × = 18 X× = 24×
X× × = 4 X× = 18×
= 10 7X–4X = 21
X+ x = 20 ×x+ ×45 = 12
解方程
51-4.5=(51-10X)×3 3X-2×(10-X)=15
(1-X)÷3=2-X X÷25+X÷5=X-19
1÷( ×□- ) =
简便计算:
25×37×0.4 75×0.39×4
125×39×16
101×99-897
简便计算:
41×35×2 136×4.06+4.06×64
7.02×123+877×7.02
102×5.6-5.6×2
471×0.25-0.25×71 43×126-86×13
计算:
× + ÷
解方程:
χ ÷5 = ÷χ =
45 χ = 1825 X – 60% X =18
35 X + 2.5×8=95 40%X+30=80
4χ+ χ= 9 χ- =
计算:
3- - × + ×
解方程:
χ= χ×( + )=
计算下列各题,能简算的要简算:
25×13 ÷52 ×310 13.09-8.12-4.88
12×103-4500÷75 18 ×[12 ÷(35 ×109 )]
(215 +311 )×15×11 37.5+19.5÷2.5×4
解方程:
34 x-58 =56 ×30% 6:x=37 :13
计算:
[1–( + )]÷ – × ÷3
(1– × )÷ ÷ ×7
( – )÷( + ) [1–( + )]÷3.5
解方程:
X× × = 4 ×x+ ×45 = 12
计算:
3- - × + ×
× + ÷ 18×( + )
×7+ ×5 ( - )×24-
( × + )÷ ÷[( + )× ]