一、计算题
1.直接写得数:
0.8×2.5= 14.07÷7= 20 ÷0.1= 6.4÷64= 4÷0.5=
0.24÷0.8= 5.8÷100= 6.09÷0.3= 2.4×0.5= 3.1×20=
2.1×0.6= 19.23+17.77= 3.4a-2.1a= 6.7×5×0.2=
2.3+2.5×0.4= 3.1+1.25×8= 12.69-12.69÷10= 0.6×0.5÷0.6×0.5= 7.2+2.8×0= 2.1+0÷0.3= 2.5×32×1.25= 12.3÷0.3=
2.列竖式计算并验算。
4.08×8.5= 20.16÷3.2= 3.75×2.3= 15.75÷2.1= 79.2÷2.2= 10.88÷3.2= 4.75÷2.5= 0.68×2.3=
0.64×7.5= 5.03×2.6= 7.1÷0.25= 4.066÷3.8= 1.89÷0.54= 88.02÷2.7= 96.24÷2.4= 4.35÷1.5=
2.278÷3.4= 61.56÷9.5= 3.14×2.6= 62.7×5.4=
3.递等式计算,能简便计算的要简便计算
5.98÷2.3×6.5 1.25×1.3×0.8 0.25×37×4 93.9×1.25-1.25×13.9 13.5×2.5+26.5×2.5
13.29+69.6÷2.4 6.07×99+6.07 3.42×101-3.42
2.3×9.9+0.1×2.3 10.1×7.8-0.1×7.8 16-4×2.5 3.8+1.2×4.5 1.6×3.9÷2.4 15÷1.251.25×5.6×0.5
15÷1.25÷8 5.6÷1.6 7.2÷0.2÷8 16÷0.4÷2.5 3.58÷0.8÷12.5 1.25×0.63×8
2.5×8.5×4 9.9×8.5 8.8×12.5 5.6×10.1 7.2×3.9+7.2×6.1 10.44÷1.2×0.37 12÷4.8+5.6 1.25×6.4×2.5 5.9×8.4+2.6×5.9-5.9 7.75+2.25×6 30.15÷1.5-0.12×0.25
1.25×3.2×2.5 27.2÷(21.61-8.01)×0.64
15.72-4.38÷2.4 3.54×7.7+12.3×3.54 20÷0.2÷2.5 (2.5+0.25)×4 3.8×12.3-3.8×2.38 2.09×0.36+0.8×26.4
12.6-5.4-4.6 7.2÷4 ÷0.9
4.解方程
1.5x+x=8 4x-3×15=11 17(x-8)=204 4x-7.2=2.4 X-0.75x=1.25 6(y+1.2)=12.6 2.5y+7.2=15.4 2.5x+3.2x=11.4 x÷4=1.2
7x+2.5=8.8 4×(x-2.8)=26.4 6X=4.2 7.2÷(x+0.38)=8 X-12=81 X÷0.4=12.5
5.1+X=10.5 4x+15=25 0.8×6-3x=0.3
2(x-2)=6.4 2(7.5+x)=19.6 (6+x)÷1.6=12
4y+2y=1.8 8.4x-9.6=57.6 6x-12=72
X-0.36x=12.8 5x-1.5×8=43 1.5m-0.6m=4.5 40÷(n+0.9)=8
5.计算.
(1)当a=4.5,b=2.3时,求ab的值。
(2)当x=4.5,y=0.9时,求x÷y的值。
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