Question

Tính bằng cách thuận tiện nhất

2x30+30+5x30+603059-213+214-87

 

Answer 1

1, 2x30+30+5x30+60=30x(2+1+5)+60=30x8+60=240+60=300

2,3059-213+214-87=(3059-87)+(214-213)=2972+1=2973

nha

Answer 2

1. 2 × 30 + 30 + 5 × 30 + 60

= 2 × 30 + 30 × 1 + 5 × 30 + 30 × 2

= 30 × ( 2 + 1 + 5 + 2 )

= 30 × 10

= 300

2. 3059 - 213 + 214 - 87

= ( 3059 - 87 ) + ( 214 - 213 )

= 2972 + 1

= 2973

Cbht