一. 口算× 3= 5÷ = ÷ = × ÷ = ÷ = ×( + )= × = ÷5= 0÷ = - =二. 脱式计算,能简算的就简算3.2×6+(1.5+2.5)÷1.60.12× 4.8÷0.12×4.8907×99+90787.5÷12.5÷8三. 解方程0.36×5- 34 x = 35 25 X-13 X=310 70%X + 20%X = 3.65X-3× = 0.36×5- 34 x = 35 12 x- 25%x = 10x―0.8x―6=1645%x=45

问题描述:

一. 口算
× 3= 5÷ = ÷ = × ÷ = ÷ =
×( + )= × = ÷5= 0÷ = - =
二. 脱式计算,能简算的就简算
3.2×6+(1.5+2.5)÷1.6
0.12× 4.8÷0.12×4.8
907×99+907
87.5÷12.5÷8
三. 解方程
0.36×5- 34 x = 35
25 X-13 X=310
70%X + 20%X = 3.6
5X-3× =
0.36×5- 34 x = 35
12 x- 25%x = 10
x―0.8x―6=16
45%x=45

1 看不懂
2 19.2+2.5=21.7 0.12×(4.8+4.8)=1.152
907×(100-1)=907×100-907×1=89793
7÷8=8分之7
3 ⑴1.8-34X =35
34X =33.2
X ≈0.98
⑵12X=310 X ≈25.8
⑶ 90%X=3.6
X =4
⑷2X
⑸11.75X=10
X≈0.85
⑺0.2X = 10
X =50
⑻0.45X=45
X=100