Toán Lớp 5: a)0,345 x 400 + 34,5 : 0,125 – 69
b)3,56 x 2 + 178% : 1/5 + 1,78
f. 20,12 x 80 + 40,24 x 2 + 201,2
g. 3,65 : 0,125 + 3,65 : 0,25 – 7,3
Leave a reply
Register Now
Login
Lost Password
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Toán Lớp 5: a)0,345 x 400 + 34,5 : 0,125 – 69
b)3,56 x 2 + 178% : 1/5 + 1,78
f. 20,12 x 80 + 40,24 x 2 + 201,2
g. 3,65 : 0,125 + 3,65 : 0,25 – 7,3
Comments ( 1 )
a) 0,345 × 400 + 34,5 : 0,125 – 69
= 0,345 × 100 × 4 + 34,5 × 8 – 34,5 × 2
= 34,5 × 4 + 34,5 × 8 – 34,5 × 2
= 34,5 × ( 4 + 8 – 2 )
= 34,5 × 10
= 345
b) 3,56 × 2 + 178% : $\dfrac{1}{5}$ + 1,78
= 1,78 × 2 × 2 + 1,78 : 0,2 + 1,78
= 1,78 × 4 + 1,78 × 5 + 1,78
= 1,78 × ( 4 + 5 + 1 )
= 1,78 × 10
= 17,8
f) 20,12 × 80 + 40,24 × 2 + 201,2
= 20,12 × 80 + 20,12 × 2 × 2 + 20,12 × 10
= 20,12 × 80 + 20,12 × 4 + 20,12 × 10
= 20,12 × ( 80 + 4 + 10 )
= 20,12 × 94
= 1891,28
g) 3,65 : 0,125 + 3,65 : 0,25 – 7,3
= 3,65 × 8 + 3,65 × 4 – 3,65 × 2
= 3,65 × ( 8 + 4 – 2 )
= 3,65 × 10
= 36,5