1) (-28)×(-5)-7×8= 140-56= 54
2) (-29)×3-(-10)×12= -87-(-120)= -87+120= 33
3) -15×(-22)-(-3)×(-24)= 330-72= 258
4) -31×(-11)-(-14)×(-12)= 341-168= 173
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1) (-28)×(-5)-7×8= 140-56= 54
2) (-29)×3-(-10)×12= -87-(-120)= -87+120= 33
3) -15×(-22)-(-3)×(-24)= 330-72= 258
4) -31×(-11)-(-14)×(-12)= 341-168= 173