
一、直接写出得数。
0.77+0.33= 87×= 0.9+99×0.9=
7÷1.4= ÷2= 6.38-(1.9+2.38)=
÷2÷= - = - + =
二、计算,能简算的要简便计算。
(1)39×2+198 (2)45.78+45.78×99 (3)÷9×÷
(4)360÷(1.8×2) (5)6.28+3.5+3.72 (6)×+×
(7)3.6-2.8+7.4-7.2 (8)12÷( -)-20
(9)3×(150-1530÷15) (10)÷[(+)×]
(11)(1-0.95)÷0.01 (12)+(+)
(13)3.72×99+3.72 (14)5-×-
(15)9-(3+0.4) (16)7.8×+2.2×20%
(17)34.7-+65.3- (18)(+-)×12
(19)0.25×32×12.5 (20)×[-(-)]
三、解方程。
(1)30%X=3.6 (2)4X-24=48 (3)20-4 X=5
(4) : =: X (5) ×+75% X= (6)0.4:0.25=
(6)x÷20%=5 (8)x×(1+30%)=3.9 (9)15%x+21%x=18
(10)x:=1.5 (11)x-20%x=6.4 (12)x-×=
(13) :=:X (14) 0.8:4=X:8 (15) :X=3:12
(16) = (17) X:4=:8 (18) :X=:
(19) :X=: (20)1.25:0.25=X:1.6 (21)72:X=
(22)4:5.2=X:6.5 (23)2.4:X=: (24): =8:X
(25)= (26) = (27)=
(28)X:=4.5:2 (29)X:0.25=4: (30):X=0.2:
(31)X:75%=: (32)1.2:3.6=:X (33)X:=6
