Question

Làm giúp mình bài 5,6,7

Answer 1

Bài 5:

310cm+45dm=4810cm

687cm-23dm=457cm

42dm+27dm=6900cm

950cm-320cm=63dm

Answer 2

Bài 6:

a) Ta có: Y:4=0

nên Y=0

Vậy: Y=0

b) Ta có: y-124=345

nên y=345+124=469

Vậy: y=469

Answer 3

Bài 7:

32:4+321=8+321=329

20x5-47=100-47=53

Answer 4

\(5)310cm+45dm=760cm\\687cm-23dm=467cm\\42dm+27dm=690cm\\950cm-320cm=63dm\\6)y:4=0\\y=0 \times 4=0\\Vậy\,\,y=0\\y-124=345\\y=345+124\\y=469\\Vậy\,\,y=469\\7)32:4+321\\=8+321\\=329\\20 \times 5-47\\=100-47\\=53\)