1、计算(能简算的要简算)
3-- ×+× 18×(+) ×7+×5
(-)×(24-) (×+)÷ ÷[(+)×]
()
(32×+17)÷ (25+)÷+ ×+×+
(21×+×21)×
(99+)÷9 ×÷ ÷[(+)×] (+)×30
+3÷ ×-÷ 4-- ×58+×41+
××- ×+÷ ÷[(-)÷]
0.25×37.5%+× 25%×+×25% ÷÷
×0.35+0.65÷ ÷4÷ +÷
5÷-÷5 2-÷- ×1000-
(+)×15 ×+÷9 32÷÷
+++ +(+) ÷(3--)
2、解方程
X- X= 2X + = 70%X + 20%X = 3.6
X×=20× 25% + 10X = X - 15%X = 68
X+X=121 5X-3×= X÷=12
6X+5 =13.4 3X=
X÷= X+X= 4X-6×=2
÷X= X = X = ×
X÷ =× 4x-3 ×9 = 29 x + x = 4
X-21×=4
6X+5 =13.4 X-X= 4χ-6=38
5X= X= X÷=
X÷=12 X= X=×
X÷=÷ X-0.25= =30%
4+0.7X=102 X+X=42 X+X=105
X-X=400 X-0.125X=8 =
X+X=18 X×( + )= x-0.375x=
x×+=4× X-X=12 5 X-2.4×5=8
0.36×5- x = (x- 4.5) = 7 x- 25%x = 10
x- 0.8x = 16+6 20 x– 8.5= 1.5 x- x -4= 21
X+25%X=90 X-X=