Question

tính

1) 18 + 14 + 16 + 35 + 110 + 160 + 150 + 145 + 158 + 140 + 55 + 25

2) 62 + 78 + 48 + 96 + 85 + 91

3) 107 + 439 + 666 + 673 + 358 + 187

4) 187 + 62 + 78 + 48 + 96 + 85 + 91 + 107 + 439 + 666 + 673 + 358

Answer 1

k fai tính nhanh thì dùng máy tính nah

Answer 2

1) 18+14+16+35+110+160+150+145+158+140+55+25

= (14+16)+(35+25)+(145+55)+(140+160)+(158+18)+(110+150)

= 30+ 60 +200+ 300+ 176+ 260

= 590+ 436= 1026.

2) 62+ 78 +48+ 96+85+ 91

= (62 +48)+ (96 +85 +91+ 78)

= 110 + 350= 460.

3) 107 +439 + 666 +673+ 358 + 187

= (107 + 673) + ( 439 + 666) + ( 358+ 187)

= 780 + (1105 + 545)

= 780+ 1650= 2430.

4) 187 + 62+ 78+48+ 96+ 85+ 91+107+ 439+ 666+ 673+ 358

= (187 + 673) + ( 62+ 78)+ (439+ 91)+ ( 85+ 358+ 107)+ (666+ 96+ 48) 

= (860+ 140)+ (530+ 550+ 810)

= 1000+ 1890= 2890.

Answer 3

ghê rồi