Bài 1 trang 13 VBT Toán 5 tập 1.

3/8

Tính

a)25+35 = ...........................................................................................................................

13−212 = ................................................................................................................................

5+14 = ..................................................................................................................................

1−12+16 = ...........................................................................................................................

b) 27+15 = ...........................................................................................................................

23−58 = ................................................................................................................................

78+16 = ................................................................................................................................

1+(47−14) = .......................................................................................................................

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Giải thích

a) 25+35 = 55=1

13−212= 412−212=212=16

5+14= 204+14=214

1−12+16 = 66−36+16=46=23

b) 27+15 = 1035+725=1735

23−58= 1624−1524=124

78+16= =4248+848=5048=2524

1+(47−14) = 1+(1628−728) = 1+928 = 2828+928=3728