Question

hello can you solve this

Answer 1

You have done right.

the fourth one is

[13+(-12)]+(-21)=(-1) + [(-12)+(-7)]


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Answer 2

$\small {[13 + ( - 12)] + (.....) = ..... + [( - 12)} \\ + ( - 7)] \\ \small{[13 + ( - 12)] + \underline{(1)} = \underline{21} + [( - 12) + ( - 7)]} \\ > > 1 + 1 = 21 - 19 \\ > > 2 = 2$