Question

Tính nhanh :

1) 18× 76 + 24 × 18 -150

2) 147+230 +53 + 70

3) 7 × 85 + 27 × 7 - 7 ×12

 

Answer 1

a,18 . 76 + 24 . 18 - 150 = 18 . ( 76 + 24 ) - 150= 18 . 100 - 150 = 1800 - 150=1650

b, 147 + 230 + 53 + 70 = ( 147 + 53 ) + ( 230 + 70) = 200 + 300=500

c,  7 . 85 + 27 . 7 - 7 . 12=(85 + 27 -12 ) . 7=100 . 7=700

Dấu . là phép nhân

Answer 2

1) 18 . 76 + 24 . 18 -150

= 18( 76 + 24 ) - 150 

= 18 . 100 -150

= 1800 - 150

= 1650

2) 147+230 +53 + 70

= ( 147 + 53 ) + ( 230 + 70 )

= 200 + 200

= 400

3) 7 × 85 + 27 × 7 - 7 ×12

= 7( 85 + 27 - 12 )

= 7 . 100

= 700